{
  "paper": {
    "school": "CHIJ Primary (Toa Payoh)",
    "year": 2022,
    "level": "P3",
    "label": "Semestral Assessment 2",
    "source_prefix": "CHIJ 2022 P3 Semestral Assessment 2",
    "has_answer_key": true
  },
  "questions": [
    {
      "n": 1,
      "type_id": 1,
      "question": "What is the value of the digit '6' in the number 6987?",
      "answer0": "6",
      "answer1": "60",
      "answer2": "600",
      "answer3": "6000",
      "correct_answer": 3,
      "skill_id": 66,
      "difficulty_id": 1,
      "explanation": "The digit 6 is in the thousands place, so its value is 6000.",
      "hints": ["Identify the place of the digit 6.", "6 is in the thousands column."],
      "source": "CHIJ 2022 P3 Semestral Assessment 2 Q1",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": ""
    },
    {
      "n": 2,
      "type_id": 1,
      "question": "What is the missing number in this pattern?",
      "answer0": "2544",
      "answer1": "2744",
      "answer2": "3344",
      "answer3": "3544",
      "correct_answer": 0,
      "skill_id": 69,
      "difficulty_id": 1,
      "explanation": "The numbers decrease by 400 each time: 3744, 3344, 2944, 2544, 2144. The missing number is 2544.",
      "hints": ["Find the difference between consecutive numbers.", "Each number goes down by 400."],
      "source": "CHIJ 2022 P3 Semestral Assessment 2 Q2",
      "image_needed": true,
      "image_page": 3,
      "image_loc": "row of five banner/pennant shapes below the question, showing 3744, 3344, 2944, ?, 2144",
      "image_options": false,
      "image_file": "q2.png",
      "notes": "Pattern values: 3744, 3344, 2944, [?], 2144."
    },
    {
      "n": 3,
      "type_id": 1,
      "question": "Mr Leong asked his pupils to convert 9 m 6 cm to cm. Which pupil wrote it correctly?",
      "answer0": "Alan: 96 cm",
      "answer1": "Boon Huat: 906 cm",
      "answer2": "Fadhila: 960 cm",
      "answer3": "Zachery: 9006 cm",
      "correct_answer": 1,
      "skill_id": 86,
      "difficulty_id": 2,
      "explanation": "9 m = 900 cm, plus 6 cm = 906 cm. Boon Huat is correct.",
      "hints": ["1 m = 100 cm.", "9 m = 900 cm, then add 6 cm."],
      "source": "CHIJ 2022 P3 Semestral Assessment 2 Q3",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Options come from a table of pupil/answer; rendered as text options."
    },
    {
      "n": 4,
      "type_id": 1,
      "question": "5 threes + 2 threes = [?]",
      "answer0": "2 X 3",
      "answer1": "2 X 5",
      "answer2": "3 X 3",
      "answer3": "7 X 3",
      "correct_answer": 3,
      "skill_id": 73,
      "difficulty_id": 1,
      "explanation": "5 threes + 2 threes = 7 threes = 7 x 3.",
      "hints": ["Add the number of 'threes' together.", "5 threes + 2 threes = 7 threes."],
      "source": "CHIJ 2022 P3 Semestral Assessment 2 Q4",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Stem has a fill blank but answer is chosen from 4 options, so MCQ."
    },
    {
      "n": 5,
      "type_id": 1,
      "question": "The bar graph shows the number of books borrowed by 4 children in the month of December. Who borrowed the most number of books?",
      "answer0": "Amy",
      "answer1": "Benny",
      "answer2": "Claire",
      "answer3": "Danny",
      "correct_answer": 2,
      "skill_id": 102,
      "difficulty_id": 1,
      "explanation": "Claire's bar reaches 28, the longest of the four. Claire borrowed the most.",
      "hints": ["Compare the lengths of the bars.", "The longest bar shows the most books."],
      "source": "CHIJ 2022 P3 Semestral Assessment 2 Q5",
      "image_needed": true,
      "image_page": 4,
      "image_loc": "horizontal bar graph below the question, bars for Amy, Benny, Claire, Danny with x-axis 0 to 30",
      "image_options": false,
      "image_file": "q5.png",
      "notes": "Bars approx: Amy 22, Benny 14, Claire 28, Danny 18."
    },
    {
      "n": 6,
      "type_id": 1,
      "question": "Which 2 lines are perpendicular to line LO in the rectangle?",
      "answer0": "ML and NO",
      "answer1": "ML and MN",
      "answer2": "MO and ML",
      "answer3": "MN and NO",
      "correct_answer": 0,
      "skill_id": 100,
      "difficulty_id": 2,
      "explanation": "LO is the bottom side of the rectangle. The two vertical sides ML and NO meet LO at right angles, so they are perpendicular to LO.",
      "hints": ["Perpendicular lines meet at a right angle.", "Look at the sides that join LO at the corners."],
      "source": "CHIJ 2022 P3 Semestral Assessment 2 Q6",
      "image_needed": true,
      "image_page": 4,
      "image_loc": "grid rectangle to the right of the options, labelled M (top-left), N (top-right), L (bottom-left), O (bottom-right) with a diagonal line",
      "image_options": false,
      "image_file": "q6.png",
      "notes": ""
    },
    {
      "n": 7,
      "type_id": 1,
      "question": "What time does the clock show?",
      "answer0": "20 minutes to 10",
      "answer1": "50 minutes past 10",
      "answer2": "20 minutes to 11",
      "answer3": "40 minutes past 11",
      "correct_answer": 2,
      "skill_id": 89,
      "difficulty_id": 2,
      "explanation": "The minute hand points to 8 (40 minutes) and the hour hand is between 10 and 11, so the time is 10:40, which is 20 minutes to 11.",
      "hints": ["Read the minute hand first.", "Minute hand at 8 means 40 minutes, or 20 minutes to the next hour."],
      "source": "CHIJ 2022 P3 Semestral Assessment 2 Q7",
      "image_needed": true,
      "image_page": 5,
      "image_loc": "analogue clock face to the right of the question",
      "image_options": false,
      "image_file": "q7.png",
      "notes": "Clock shows 10:40."
    },
    {
      "n": 8,
      "type_id": 1,
      "question": "What is the amount of money shown?",
      "answer0": "$15.55",
      "answer1": "$15.85",
      "answer2": "$16.55",
      "answer3": "$16.85",
      "correct_answer": 3,
      "skill_id": 82,
      "difficulty_id": 2,
      "explanation": "$10 + $5 notes = $15; coins $1 + 50c + 20c + 10c + 5c = $1.85; total = $16.85.",
      "hints": ["Add the notes first, then the coins.", "Count every coin: $1, 50c, 20c, 10c, 5c."],
      "source": "CHIJ 2022 P3 Semestral Assessment 2 Q8",
      "image_needed": true,
      "image_page": 5,
      "image_loc": "below the question: a $10 note, a $5 note, and a cluster of coins ($1, 50c, 20c, 10c, 5c)",
      "image_options": false,
      "image_file": "q8.png",
      "notes": "Key answer is option 4 ($16.85), which requires a $1 coin in the cluster; ensure the crop shows all coins clearly."
    },
    {
      "n": 9,
      "type_id": 1,
      "question": "Which fraction is equivalent to 1/2 ?",
      "answer0": "1/12",
      "answer1": "2/4",
      "answer2": "6/8",
      "answer3": "3/4",
      "correct_answer": 1,
      "skill_id": 77,
      "difficulty_id": 1,
      "explanation": "2/4 simplifies to 1/2, so it is equivalent to 1/2.",
      "hints": ["Simplify each fraction.", "Which one halves to 1/2?"],
      "source": "CHIJ 2022 P3 Semestral Assessment 2 Q9",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": ""
    },
    {
      "n": 10,
      "type_id": 1,
      "question": "Which one of the following will add up to an answer that is an odd number?",
      "answer0": "1333 + 2001",
      "answer1": "1245 + 2321",
      "answer2": "1719 + 2002",
      "answer3": "1609 + 2131",
      "correct_answer": 2,
      "skill_id": 70,
      "difficulty_id": 2,
      "explanation": "An odd sum needs one odd and one even number. 1719 (odd) + 2002 (even) = 3721, which is odd.",
      "hints": ["Odd + even = odd; odd + odd = even.", "Look for one odd and one even addend."],
      "source": "CHIJ 2022 P3 Semestral Assessment 2 Q10",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": ""
    },
    {
      "n": 11,
      "type_id": 1,
      "question": "4 thousands 27 hundreds = [?] thousands and 17 hundreds.",
      "answer0": "7",
      "answer1": "6",
      "answer2": "5",
      "answer3": "4",
      "correct_answer": 2,
      "skill_id": 66,
      "difficulty_id": 2,
      "explanation": "4 thousands 27 hundreds = 4000 + 2700 = 6700. As (?) thousands + 17 hundreds (1700): 6700 - 1700 = 5000 = 5 thousands.",
      "hints": ["First find the total value: 4000 + 2700.", "Subtract 1700 (17 hundreds), then count the thousands."],
      "source": "CHIJ 2022 P3 Semestral Assessment 2 Q11",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Stem has a fill blank but the answer is chosen from 4 options, so MCQ."
    },
    {
      "n": 12,
      "type_id": 1,
      "question": "How many of the marked angles inside the figure are obtuse angles and acute angles?",
      "answer0": "Obtuse 3, Acute 3",
      "answer1": "Obtuse 4, Acute 3",
      "answer2": "Obtuse 4, Acute 2",
      "answer3": "Obtuse 5, Acute 2",
      "correct_answer": 1,
      "skill_id": 99,
      "difficulty_id": 3,
      "explanation": "Counting the marked angles in the figure gives 4 obtuse angles and 3 acute angles.",
      "hints": ["An obtuse angle is bigger than a right angle; an acute angle is smaller.", "Check each marked angle against a right angle."],
      "source": "CHIJ 2022 P3 Semestral Assessment 2 Q12",
      "image_needed": true,
      "image_page": 6,
      "image_loc": "grid figure above the question with several marked angles; the answer table is rendered as the four text options",
      "image_options": false,
      "image_file": "q12.png",
      "notes": "Count to verify against figure: key = 4 obtuse, 3 acute."
    },
    {
      "n": 13,
      "type_id": 1,
      "question": "There are 266 children going to the zoo. There are 7 buses and each bus can seat 35 children. How many children will not have a seat?",
      "answer0": "5",
      "answer1": "21",
      "answer2": "38",
      "answer3": "245",
      "correct_answer": 1,
      "skill_id": 76,
      "difficulty_id": 2,
      "explanation": "7 buses x 35 seats = 245 seats. 266 - 245 = 21 children without a seat.",
      "hints": ["First find the total number of seats.", "Subtract the seats from 266."],
      "source": "CHIJ 2022 P3 Semestral Assessment 2 Q13",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": ""
    },
    {
      "n": 14,
      "type_id": 1,
      "question": "Mr Colman wants to travel from City A to City D. What is the distance of the shortest route that he should take?",
      "answer0": "2334 m",
      "answer1": "2766 m",
      "answer2": "4864 m",
      "answer3": "5269 m",
      "correct_answer": 2,
      "skill_id": 87,
      "difficulty_id": 3,
      "explanation": "A-B-D = 2530 m + 2 km 334 m (2334 m) = 4864 m. A-C-D = 2 km 503 m (2503 m) + 2766 m = 5269 m. The shorter route is A-B-D = 4864 m.",
      "hints": ["Convert km and m to metres first.", "Add up each route, then compare."],
      "source": "CHIJ 2022 P3 Semestral Assessment 2 Q14",
      "image_needed": true,
      "image_page": 7,
      "image_loc": "map diagram below the question: City A, City B (top), City C (bottom), City D, with labelled distances 2530m, 2km 334m, 2km 503m, 2766m",
      "image_options": false,
      "image_file": "q14.png",
      "notes": "Route distances: A-B 2530m, B-D 2334m, A-C 2503m, C-D 2766m."
    },
    {
      "n": 15,
      "type_id": 1,
      "question": "Jack, Marcy, Tabby and Porsha have some stickers. Jack has 15 more stickers than Marcy. Marcy has 28 fewer stickers than Tabby. Porsha has 10 more stickers than Jack. Who has the most stickers?",
      "answer0": "Jack",
      "answer1": "Marcy",
      "answer2": "Porsha",
      "answer3": "Tabby",
      "correct_answer": 3,
      "skill_id": 71,
      "difficulty_id": 3,
      "explanation": "Let Marcy = M. Jack = M+15, Porsha = M+25, Tabby = M+28. Tabby has the most (M+28).",
      "hints": ["Compare everyone to Marcy.", "Tabby = Marcy + 28, the largest amount above Marcy."],
      "source": "CHIJ 2022 P3 Semestral Assessment 2 Q15",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": ""
    },
    {
      "n": 16,
      "type_id": 2,
      "question": "2503 = 2000 + [?] + 3",
      "answer0": "500",
      "correct_answer": null,
      "skill_id": 66,
      "difficulty_id": 1,
      "explanation": "2503 - 2000 - 3 = 500. The missing number is 500.",
      "hints": ["2503 = 2 thousands, 5 hundreds, 3 ones.", "The middle box is the hundreds: 500."],
      "source": "CHIJ 2022 P3 Semestral Assessment 2 Q16",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": ""
    },
    {
      "n": 17,
      "type_id": 2,
      "question": "Convert 205 min into hours and minutes. [?] h [?] min",
      "answer0": "3",
      "answer1": "25",
      "correct_answer": null,
      "skill_id": 91,
      "difficulty_id": 1,
      "explanation": "205 min = 180 min + 25 min = 3 h 25 min.",
      "hints": ["1 hour = 60 minutes.", "How many whole 60s are in 205?"],
      "source": "CHIJ 2022 P3 Semestral Assessment 2 Q17",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Answer blanks: h and min."
    },
    {
      "n": 18,
      "type_id": 2,
      "question": "Arrange the following fractions from the greatest to the smallest. 3/5 , 1/4 , 7/10 [?] , [?] , [?]",
      "answer0": "7/10",
      "answer1": "3/5",
      "answer2": "1/4",
      "correct_answer": null,
      "skill_id": 79,
      "difficulty_id": 2,
      "explanation": "Convert to tenths/twentieths: 7/10 = 0.7, 3/5 = 0.6, 1/4 = 0.25. Greatest to smallest: 7/10, 3/5, 1/4.",
      "hints": ["Give the fractions a common denominator.", "Use 20: 14/20, 12/20, 5/20."],
      "source": "CHIJ 2022 P3 Semestral Assessment 2 Q18",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Ordering task -> FIB, greatest first."
    },
    {
      "n": 19,
      "type_id": 2,
      "question": "The graph shows the amount of money Tara saved from her daily pocket money of $2 over five days. How much money did Tara save on Monday? [?] cents",
      "answer0": "70",
      "correct_answer": null,
      "skill_id": 104,
      "difficulty_id": 1,
      "explanation": "The Monday bar reaches 70 on the vertical axis, so Tara saved 70 cents.",
      "hints": ["Read the height of the Monday bar.", "The axis is in cents."],
      "source": "CHIJ 2022 P3 Semestral Assessment 2 Q19",
      "image_needed": true,
      "image_page": 9,
      "image_loc": "vertical bar graph 'Pocket money saved' above the question; bars for Monday to Friday, y-axis 0-160 cents",
      "image_options": false,
      "image_file": "q19.png",
      "notes": "Shared graph for Q19 and Q20. Bars: Mon 70, Tue 120, Wed 40, Thu 150, Fri 100."
    },
    {
      "n": 20,
      "type_id": 2,
      "question": "The graph shows the amount of money Tara saved from her daily pocket money of $2 over five days. On which day did Tara spend the most money?",
      "answer0": "Wednesday",
      "correct_answer": null,
      "skill_id": 104,
      "difficulty_id": 2,
      "explanation": "She is given $2 (200 cents) daily; spending = 200 - saved. The least saved (40 cents on Wednesday) means the most spent (160 cents). Answer: Wednesday.",
      "hints": ["Spent = 200 cents - amount saved.", "The day she saved the least is the day she spent the most."],
      "source": "CHIJ 2022 P3 Semestral Assessment 2 Q20",
      "image_needed": true,
      "image_page": 9,
      "image_loc": "same 'Pocket money saved' bar graph above Q19 (top of page)",
      "image_options": false,
      "image_file": "q20.png",
      "notes": "Word answer (a day) but a single definite value, kept as FIB. Shares graph with Q19."
    },
    {
      "n": 21,
      "type_id": 2,
      "question": "Study the figure carefully. Name a line parallel to AG. AG // [?]",
      "answer0": "DE",
      "correct_answer": null,
      "skill_id": 100,
      "difficulty_id": 2,
      "explanation": "In the figure, line DE runs in the same direction as AG and never meets it, so AG is parallel to DE.",
      "hints": ["Parallel lines point in the same direction and never cross.", "Look for the line that slants the same way as AG."],
      "source": "CHIJ 2022 P3 Semestral Assessment 2 Q21",
      "image_needed": true,
      "image_page": 10,
      "image_loc": "grid figure at top of page with points A, B, C, D, E, F, G",
      "image_options": false,
      "image_file": "q21.png",
      "notes": "Part (a) 'draw a perpendicular line through F' is an interactive draw task (skipped); only part (b) AG // DE is captured as the FIB answer."
    },
    {
      "n": 22,
      "type_id": 2,
      "question": "1/3 + 3/9 = [?] Give your answer in the simplest form.",
      "answer0": "2/3",
      "correct_answer": null,
      "skill_id": 81,
      "difficulty_id": 2,
      "explanation": "1/3 = 3/9, so 3/9 + 3/9 = 6/9 = 2/3.",
      "hints": ["Make the denominators the same (ninths).", "1/3 = 3/9, then add and simplify."],
      "source": "CHIJ 2022 P3 Semestral Assessment 2 Q22",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key shows 6/9 = 2/3; simplest form 2/3."
    },
    {
      "n": 23,
      "type_id": 2,
      "question": "How many tens are there in the quotient of 1560 ÷ 6? [?] tens",
      "answer0": "26",
      "correct_answer": null,
      "skill_id": 75,
      "difficulty_id": 2,
      "explanation": "1560 ÷ 6 = 260. In 260 there are 26 tens.",
      "hints": ["First work out 1560 ÷ 6.", "Then count the tens in the quotient 260."],
      "source": "CHIJ 2022 P3 Semestral Assessment 2 Q23",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key gives 1560 ÷ 6 = 260 tens shorthand; the quotient is 260, which has 26 tens. Answer = 26."
    },
    {
      "n": 24,
      "type_id": 2,
      "question": "There are 3546 chocolate cupcakes. There are 1649 more chocolate than vanilla cupcakes. How many vanilla cupcakes are there?",
      "answer0": "1897",
      "correct_answer": null,
      "skill_id": 71,
      "difficulty_id": 2,
      "explanation": "3546 - 1649 = 1897 vanilla cupcakes.",
      "hints": ["Vanilla has fewer than chocolate.", "Subtract 1649 from 3546."],
      "source": "CHIJ 2022 P3 Semestral Assessment 2 Q24",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": ""
    },
    {
      "n": 25,
      "type_id": 2,
      "question": "The sum of two numbers is 300. The difference between the two numbers is 70. What is the smaller number?",
      "answer0": "115",
      "correct_answer": null,
      "skill_id": 71,
      "difficulty_id": 3,
      "explanation": "Smaller number = (sum - difference) ÷ 2 = (300 - 70) ÷ 2 = 230 ÷ 2 = 115.",
      "hints": ["Take away the difference, then split equally.", "(300 - 70) ÷ 2 = 115."],
      "source": "CHIJ 2022 P3 Semestral Assessment 2 Q25",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": ""
    },
    {
      "n": 26,
      "type_id": 2,
      "question": "What is the mass of each hexagon? [?] kg",
      "answer0": "4",
      "correct_answer": null,
      "skill_id": 87,
      "difficulty_id": 3,
      "explanation": "From the balances, each hexagon weighs 4 kg (key answer).",
      "hints": ["Use both balances together.", "Compare the hexagons to the 24 kg pentagon."],
      "source": "CHIJ 2022 P3 Semestral Assessment 2 Q26",
      "image_needed": true,
      "image_page": 12,
      "image_loc": "two balance scales below the question: top scale has 3 hexagons vs a shaded block; bottom scale has a block + 2 hexagons vs a 24 kg pentagon",
      "image_options": false,
      "image_file": "q26.png",
      "notes": "Mass uses a hexagon symbol. Key answer 4 kg."
    },
    {
      "n": 27,
      "type_id": 2,
      "question": "The capacity of a jug is 1200 ml. 3 bottles can fill the jug completely. 4 glasses of water can fill a bottle completely. What is the capacity of a glass? [?] ml",
      "answer0": "100",
      "correct_answer": null,
      "skill_id": 87,
      "difficulty_id": 2,
      "explanation": "1 bottle = 1200 ÷ 3 = 400 ml. 1 glass = 400 ÷ 4 = 100 ml.",
      "hints": ["First find the capacity of one bottle.", "Then divide a bottle by 4 glasses."],
      "source": "CHIJ 2022 P3 Semestral Assessment 2 Q27",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": ""
    },
    {
      "n": 28,
      "type_id": 2,
      "question": "Look at the number line. What is the missing fraction?",
      "answer0": "5/6",
      "correct_answer": null,
      "skill_id": 77,
      "difficulty_id": 2,
      "explanation": "The line from 0 to 1 is divided into 6 equal parts. The marked '?' is the 5th mark, which is 5/6.",
      "hints": ["Count the equal parts between 0 and 1.", "1/2 sits at the 3rd mark; the '?' is the 5th mark."],
      "source": "CHIJ 2022 P3 Semestral Assessment 2 Q28",
      "image_needed": true,
      "image_page": 13,
      "image_loc": "number line below the question marked 0, 1/2, ?, 1 with equal tick marks",
      "image_options": false,
      "image_file": "q28.png",
      "notes": "Number line in sixths; missing fraction 5/6."
    },
    {
      "n": 29,
      "type_id": 2,
      "question": "Arrange the following in an increasing order, beginning from the smallest. 7 l 404 ml , 74 l , 7074 ml , 7004 ml [?] , [?] , [?] , [?]",
      "answer0": "7004 ml",
      "answer1": "7074 ml",
      "answer2": "7 l 404 ml",
      "answer3": "74 l",
      "correct_answer": null,
      "skill_id": 86,
      "difficulty_id": 3,
      "explanation": "Convert to ml: 7 l 404 ml = 7404 ml; 74 l = 74000 ml; 7074 ml; 7004 ml. Increasing: 7004 ml, 7074 ml, 7 l 404 ml (7404 ml), 74 l (74000 ml).",
      "hints": ["Change everything to ml first.", "1 l = 1000 ml; 74 l is by far the largest."],
      "source": "CHIJ 2022 P3 Semestral Assessment 2 Q29",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Ordering task -> FIB, smallest first. Values shown in boxes."
    },
    {
      "n": 30,
      "type_id": 2,
      "question": "Look at the number pattern carefully. What is the value of X?",
      "answer0": "18",
      "correct_answer": null,
      "skill_id": 73,
      "difficulty_id": 3,
      "explanation": "Following the multiplication pattern in the figure (each linked pair multiplies to the centre value), X = 18 (key answer).",
      "hints": ["Look at how the linked numbers combine to the middle value 72.", "Apply the same rule to find X."],
      "source": "CHIJ 2022 P3 Semestral Assessment 2 Q30",
      "image_needed": true,
      "image_page": 14,
      "image_loc": "interlocking boxes figure below the question with 2, 6, 6, 72, 2, 2, X, 9, 8, 24, 3",
      "image_options": false,
      "image_file": "q30.png",
      "notes": "Number pattern puzzle. Key answer X = 18."
    },
    {
      "n": 31,
      "type_id": 2,
      "question": "The opening hours of a clinic are shown. 9.00 a.m. to 12.30 p.m. ; 2.15 p.m. to 5.15 p.m. ; 6.30 p.m. to 9.45 p.m. How long is the clinic open each day? [?] h [?] min",
      "answer0": "9",
      "answer1": "45",
      "correct_answer": null,
      "skill_id": 93,
      "difficulty_id": 3,
      "explanation": "Session 1: 9.00 a.m.-12.30 p.m. = 3 h 30 min. Session 2: 2.15-5.15 p.m. = 3 h. Session 3: 6.30-9.45 p.m. = 3 h 15 min. Total = 9 h 45 min.",
      "hints": ["Work out each session's duration separately.", "Add the three durations together."],
      "source": "CHIJ 2022 P3 Semestral Assessment 2 Q31",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Opening hours given in a table; transcribed into the stem. Answer blanks: h and min."
    },
    {
      "n": 32,
      "type_id": 2,
      "question": "Mrs Lee sewed 7 flowers on each dress. She had 69 flowers left after sewing 183 dresses. How many flowers did Mrs Lee have at first?",
      "answer0": "1350",
      "correct_answer": null,
      "skill_id": 76,
      "difficulty_id": 2,
      "explanation": "Flowers used = 183 x 7 = 1281. With 69 left over, she started with 1281 + 69 = 1350.",
      "hints": ["First find how many flowers were sewn on.", "Add the 69 left over."],
      "source": "CHIJ 2022 P3 Semestral Assessment 2 Q32",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": ""
    },
    {
      "n": 33,
      "type_id": 2,
      "question": "Ah Koon bakery sold curry puffs at the following prices: 1 for $1.50 ; 3 for $4. Rita bought 13 curry puffs. What is the least amount that she had to pay?",
      "answer0": "$17.50",
      "correct_answer": null,
      "skill_id": 83,
      "difficulty_id": 3,
      "explanation": "Cheapest is the 3-for-$4 deal. 4 sets of 3 = 12 puffs for 4 x $4 = $16. The 13th puff = $1.50. Total = $17.50.",
      "hints": ["The bundle deal is cheaper per puff.", "Buy as many 3-for-$4 sets as possible, then single puffs."],
      "source": "CHIJ 2022 P3 Semestral Assessment 2 Q33",
      "image_needed": true,
      "image_page": 17,
      "image_loc": "price-list scroll graphic to the right of the question showing '1 for $1.50' and '3 for $4' with curry puff pictures",
      "image_options": false,
      "image_file": "q33.png",
      "notes": "Prices transcribed into the stem; figure is decorative price list."
    },
    {
      "n": 34,
      "type_id": 2,
      "question": "Martha's dance lesson starts at 5.35 p.m. She needs to be at the dance studio 25 minutes before the start of her lesson to do her warmup. The journey from Martha's house to the dance studio takes 45 minutes. (a) What time must Martha leave her house? (b) Martha's dance lesson ended at 6.45 pm. How long was her dance lesson? Give your answer in h and min. (a) [?] (b) [?]",
      "answer0": "4.25 p.m.",
      "answer1": "1 h 10 min",
      "correct_answer": null,
      "skill_id": 92,
      "difficulty_id": 3,
      "explanation": "(a) Arrive 25 min before 5.35 p.m. = 5.10 p.m.; subtract 45 min travel = 4.25 p.m. (b) 5.35 p.m. to 6.45 p.m. = 1 h 10 min.",
      "hints": ["(a) Work backwards: warmup time, then travel time.", "(b) Count from 5.35 p.m. to 6.45 p.m."],
      "source": "CHIJ 2022 P3 Semestral Assessment 2 Q34",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Two-part question; answer0 = part (a), answer1 = part (b)."
    },
    {
      "n": 35,
      "type_id": 2,
      "question": "Sue collected 2075 seashells. Lina collected 779 seashells. Sue gave Lina some seashells so that they both have an equal number of seashells in the end. How many seashells did Lina have in the end?",
      "answer0": "1427",
      "correct_answer": null,
      "skill_id": 71,
      "difficulty_id": 3,
      "explanation": "Difference = 2075 - 779 = 1296. Sue gives half, 1296 ÷ 2 = 648, to make them equal. Lina ends with 779 + 648 = 1427.",
      "hints": ["Find the difference, then share it equally.", "Total ÷ 2 also gives the final amount: (2075 + 779) ÷ 2 = 1427."],
      "source": "CHIJ 2022 P3 Semestral Assessment 2 Q35",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": ""
    },
    {
      "n": 36,
      "type_id": 2,
      "question": "A shopkeeper has a total of 14 two-dollar and ten-dollar notes. He has $76 altogether. How many two-dollar notes does he have?",
      "answer0": "8",
      "correct_answer": null,
      "skill_id": 76,
      "difficulty_id": 3,
      "explanation": "Guess-and-check: 8 two-dollar notes = $16 and 6 ten-dollar notes = $60; 8 + 6 = 14 notes and $16 + $60 = $76. So 8 two-dollar notes.",
      "hints": ["If all 14 were $2, that is only $28 - too little.", "Swap $2 notes for $10 notes until the total reaches $76."],
      "source": "CHIJ 2022 P3 Semestral Assessment 2 Q36",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": ""
    },
    {
      "n": 37,
      "type_id": 2,
      "question": "Mr Ravi and Mr Goh had the same amount of flour in their bakery. Mr Ravi used 960 g of flour while Mr Goh used 2500 g of flour to bake some bread. In the end, Mr Ravi had 3 times as much flour left as Mr Goh. How much flour did each of them have at first? Give your answer in kilograms and grams.",
      "answer0": "3 kg 270 g",
      "correct_answer": null,
      "skill_id": 87,
      "difficulty_id": 3,
      "explanation": "Difference used = 2500 - 960 = 1540 g, which equals 2 units (Ravi's 3 units minus Goh's 1 unit). 1 unit = 770 g, so Goh's leftover = 770 g. At first = 770 + 2500 = 3270 g = 3 kg 270 g.",
      "hints": ["The extra flour Goh used creates the 3-times difference.", "Difference (1540 g) = 2 units; find 1 unit, then work back to the start."],
      "source": "CHIJ 2022 P3 Semestral Assessment 2 Q37",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": ""
    }
  ]
}