{
  "paper": {
    "school": "Raffles Girls' Primary School",
    "year": 2024,
    "level": "P4",
    "label": "Weighted Assessment 1",
    "source_prefix": "Raffles 2024 P4 Weighted Assessment 1",
    "has_answer_key": true
  },
  "questions": [
    {
      "n": 1,
      "type_id": 1,
      "question": "50 000 + 900 + 8 = [?]",
      "answer0": "50 098",
      "answer1": "50 908",
      "answer2": "59 008",
      "answer3": "59 080",
      "correct_answer": 1,
      "skill_id": 105,
      "difficulty_id": 1,
      "explanation": "Add by place value: 50 000 + 900 + 8 = 50 908. There are 5 ten-thousands, 0 thousands, 9 hundreds, 0 tens and 8 ones. Answer: 50 908.",
      "hints": ["Line up the numbers by place value (ten thousands, thousands, hundreds, tens, ones).", "900 fills the hundreds place and 8 fills the ones place; the thousands and tens places are 0."],
      "source": "Raffles 2024 P4 Weighted Assessment 1 Q1",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key = option 2 (1-based) -> 0-based index 1. The stem's blank '= ___' becomes [?] for the MCQ."
    },
    {
      "n": 2,
      "type_id": 1,
      "question": "Arrange the following numbers from the greatest to the smallest.<br>9605, 9065, 9506",
      "answer0": "9065, 9605, 9506",
      "answer1": "9065, 9506, 9605",
      "answer2": "9605, 9065, 9506",
      "answer3": "9605, 9506, 9065",
      "correct_answer": 3,
      "skill_id": 107,
      "difficulty_id": 1,
      "explanation": "Compare from the largest place value. All have 9 thousands. Hundreds: 9605 and 9506 have 6 and 5 hundreds; 9065 has 0 hundreds. So 9605 > 9506 > 9065. Greatest to smallest: 9605, 9506, 9065. Answer: option 4.",
      "hints": ["Compare the thousands digit first, then hundreds, then tens, then ones.", "9605 and 9506 both start 96.. vs 95.., and 9065 has 0 hundreds so it is smallest."],
      "source": "Raffles 2024 P4 Weighted Assessment 1 Q2",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key = option 4 (1-based) -> 0-based index 3. Options listed greatest->smallest."
    },
    {
      "n": 3,
      "type_id": 1,
      "question": "Complete the number pattern.<br>5934, 5634, 5624, 5324, [?], 5014, 5004",
      "answer0": "5024",
      "answer1": "5314",
      "answer2": "5334",
      "answer3": "5624",
      "correct_answer": 1,
      "skill_id": 108,
      "difficulty_id": 2,
      "explanation": "The pattern alternates subtracting 300 then 10: 5934 -300 = 5634, -10 = 5624, -300 = 5324, -10 = 5314, -300 = 5014, -10 = 5004. The missing term is 5314. Answer: option 2.",
      "hints": ["Find the difference between each pair of consecutive numbers.", "The steps alternate: subtract 300, then subtract 10. After 5324, subtract 10."],
      "source": "Raffles 2024 P4 Weighted Assessment 1 Q3",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key = option 2 (1-based) -> 0-based index 1."
    },
    {
      "n": 4,
      "type_id": 1,
      "question": "3 and 4 are factors of [?].",
      "answer0": "15",
      "answer1": "18",
      "answer2": "20",
      "answer3": "24",
      "correct_answer": 3,
      "skill_id": 111,
      "difficulty_id": 2,
      "explanation": "A number with both 3 and 4 as factors must be a multiple of 12. Check: 15 (no), 18 (4 is not a factor), 20 (3 is not a factor), 24 = 3 x 8 = 4 x 6. So 24 has both 3 and 4 as factors. Answer: option 4.",
      "hints": ["A number that has both 3 and 4 as factors must be divisible by both.", "It must be a multiple of 12 (3 x 4); the only such option is 24."],
      "source": "Raffles 2024 P4 Weighted Assessment 1 Q4",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key = option 4 (1-based) -> 0-based index 3."
    },
    {
      "n": 5,
      "type_id": 2,
      "question": "a) Write seventy-eight thousand and twenty in numerals.<br>b) Round 39 500 to the nearest thousand.",
      "answer0": "78020",
      "answer1": "40000",
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 106,
      "difficulty_id": 1,
      "explanation": "a) Seventy-eight thousand and twenty = 78 000 + 20 = 78 020. b) 39 500 is exactly halfway between 39 000 and 40 000; rounding to the nearest thousand rounds the half up to 40 000.",
      "hints": ["For a), seventy-eight thousand is 78 000; add the twenty.", "For b), look at the hundreds digit (5) to decide rounding up; 39 500 rounds up to 40 000."],
      "source": "Raffles 2024 P4 Weighted Assessment 1 Q5",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Two blanks (a and b). Key: a)78020 b)40000."
    },
    {
      "n": 6,
      "type_id": 2,
      "question": "Find the product of 8540 and 7.",
      "answer0": "59780",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 116,
      "difficulty_id": 1,
      "explanation": "Product means multiply: 8540 x 7. 8000 x 7 = 56 000; 500 x 7 = 3500; 40 x 7 = 280. Sum: 56 000 + 3500 + 280 = 59 780.",
      "hints": ["'Product' means multiply the two numbers.", "Multiply 8540 x 7 using the column method, carrying as needed."],
      "source": "Raffles 2024 P4 Weighted Assessment 1 Q6",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key = 59780."
    },
    {
      "n": 7,
      "type_id": 2,
      "question": "Ben packed 853 books in boxes of 9. How many books were left unpacked?",
      "answer0": "7",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 117,
      "difficulty_id": 2,
      "explanation": "Divide 853 by 9 and find the remainder. 9 x 94 = 846, and 853 - 846 = 7. So 94 full boxes are packed and 7 books are left unpacked. Answer: 7 books.",
      "hints": ["Divide the total number of books by the box size of 9.", "The number left unpacked is the remainder of 853 divided by 9."],
      "source": "Raffles 2024 P4 Weighted Assessment 1 Q7",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key = 7 (remainder of 853 / 9)."
    },
    {
      "n": 8,
      "type_id": 2,
      "question": "The table shows the number of students in two classes. Part of the table is covered by ink blots.<br>How many more girls than boys are there altogether?",
      "answer0": "5",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 147,
      "difficulty_id": 2,
      "explanation": "From the table: 4A total 41 with 22 boys means 4A girls = 41 - 22 = 19 (given). 4B total 34 with 21 girls means 4B boys = 34 - 21 = 13. Total girls = 19 + 21 = 40; total boys = 22 + 13 = 35. More girls than boys = 40 - 35 = 5.",
      "hints": ["Use each class total to fill in the missing (ink-blotted) values.", "Find total girls and total boys, then subtract: 40 - 35 = 5."],
      "source": "Raffles 2024 P4 Weighted Assessment 1 Q8",
      "image_needed": true,
      "image_options": false,
      "image_file": "q8.png",
      "image_page": 5,
      "image_bbox": [0.18, 0.14, 0.74, 0.32],
      "image_loc": "table near top of page showing classes 4A, 4B, Total with boys/girls rows; some cells covered by ink blots",
      "notes": "Working from key: 34-21=13, 19+21=40, 22+13=35, 40-35=5. Final answer 5. Figure is the data table."
    },
    {
      "n": 9,
      "type_id": 2,
      "question": "Andy had $450 more than Betty. Betty gave $35 to Andy. How much more did Andy have than Betty in the end?",
      "answer0": "520",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 118,
      "difficulty_id": 2,
      "explanation": "When Betty gives $35 to Andy, Andy gains $35 and Betty loses $35, so the gap between them widens by 2 x $35 = $70. New difference = $450 + $70 = $520. Answer: $520.",
      "hints": ["Giving money to Andy increases Andy and decreases Betty, so the difference changes by twice the amount.", "Original difference $450; the gap widens by 35 x 2 = $70, giving $520."],
      "source": "Raffles 2024 P4 Weighted Assessment 1 Q9",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: 35x2=70, 450+70=520. Answer $520."
    },
    {
      "n": 10,
      "type_id": 2,
      "question": "At a bookshop, pens are sold in boxes of 6 and pencils are sold in boxes of 8. Miss Nurul bought an equal number of pens and pencils for her class. Find the least total number of pens and pencils Miss Nurul bought.",
      "answer0": "48",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 115,
      "difficulty_id": 2,
      "explanation": "For an equal number of pens and pencils, the count must be a common multiple of 6 and 8. The least common multiple of 6 and 8 is 24, so the least number of pens is 24 and the least number of pencils is 24. Total = 24 + 24 = 48.",
      "hints": ["The number of pens and pencils must each be a multiple of the box size (6 and 8) and be equal.", "Find the LCM of 6 and 8 (which is 24), then add 24 pens + 24 pencils."],
      "source": "Raffles 2024 P4 Weighted Assessment 1 Q10",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Pictures of pen/pencil boxes are decorative (box sizes stated in text). Key: 24+24=48."
    },
    {
      "n": 11,
      "type_id": 2,
      "question": "A fruit seller had 4 times as many durians as watermelons. After he sold 114 durians, he had as many watermelons as durians left. How many fruits did the fruit seller have left in the end?",
      "answer0": "76",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 118,
      "difficulty_id": 3,
      "explanation": "Let watermelons = 1 unit, durians = 4 units. After selling 114 durians, durians left = watermelons = 1 unit, so 114 durians = 4 units - 1 unit = 3 units. 1 unit = 114 / 3 = 38. Watermelons = 38 and durians left = 38, so fruits left = 38 + 38 = 76.",
      "hints": ["Draw a model: watermelons = 1 unit, durians = 4 units.", "The 114 durians sold equals 3 units, so 1 unit = 38; total left = 38 + 38 = 76."],
      "source": "Raffles 2024 P4 Weighted Assessment 1 Q11",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: 114/3=38, 38x2=76. Answer 76 fruits."
    },
    {
      "n": 12,
      "type_id": 2,
      "question": "A tank was filled with water. Water flowed out of the tank from 09 00 to 14 00.<br>a) How many litres of water was in the tank at first?<br>b) How many litres of water was in the tank at 10 00?<br>c) How many litres of water flowed out between 12 00 and 13 00?<br>d) The least amount of water flowed out during which 1-hour period? From [?] to [?]",
      "answer0": "250",
      "answer1": "220",
      "answer2": "90",
      "answer3": "1100",
      "correct_answer": null,
      "skill_id": 147,
      "difficulty_id": 2,
      "explanation": "Read the line graph. a) At 09 00 the line is at 250, so 250 litres at first. b) At 10 00 the line is at 220 litres. c) At 12 00 there are 140 litres and at 13 00 there are 50 litres, so 140 - 50 = 90 litres flowed out. d) Hourly drops: 09-10 = 30, 10-11 = 60, 11-12 = 20, 12-13 = 90, 13-14 = 50. The smallest drop (20 litres) is from 11 00 to 12 00.",
      "hints": ["Read each point off the vertical (litres) axis at the given times.", "For the least flow, compare the drop in litres for each 1-hour interval and pick the smallest."],
      "source": "Raffles 2024 P4 Weighted Assessment 1 Q12",
      "image_needed": true,
      "image_options": false,
      "image_file": "q12.png",
      "image_page": 8,
      "image_bbox": [0.15, 0.10, 0.88, 0.34],
      "image_loc": "line graph titled 'Amount of water in Tank' near top of page, litres (0-300) on y-axis vs Time (09 00-14 00) on x-axis",
      "notes": "4 answer blanks. Key: a)250 litre b)220 litre c)90 litre d)1100 to 1200. answer3 holds '1100' (start of least-flow period); the matching '1200' (end) is implied by part d. Units (litres / times) are in the question wording."
    },
    {
      "n": 13,
      "type_id": 2,
      "question": "A school bag costs $60 more than a water bottle. 3 similar school bags and 2 similar water bottles cost $280. How much does each water bottle cost?",
      "answer0": "20",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 118,
      "difficulty_id": 3,
      "explanation": "Each bag = bottle + $60. So 3 bags = 3 bottles + 3 x $60 = 3 bottles + $180. Then 3 bags + 2 bottles = 5 bottles + $180 = $280. So 5 bottles = $280 - $180 = $100, and 1 bottle = $100 / 5 = $20.",
      "hints": ["Replace each school bag with 'a bottle + $60'.", "After removing the extra 3 x $60 = $180, the remaining $100 is shared by 5 bottles."],
      "source": "Raffles 2024 P4 Weighted Assessment 1 Q13",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: 60x3=180, 280-180=100, 100/5=$20. Answer $20."
    },
    {
      "n": 14,
      "type_id": 2,
      "question": "Tammy has 35 $2 and $5 notes. The total value of the notes is $118. How many $5 notes does she have?",
      "answer0": "16",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 118,
      "difficulty_id": 3,
      "explanation": "Assume all 35 notes are $2: value = 35 x $2 = $70. The actual total is $118, which is $48 more. Each $2 note swapped for a $5 note adds $3. So number of $5 notes = $48 / $3 = 16.",
      "hints": ["Suppose all 35 notes were $2 notes and find that total ($70).", "Each swap from $2 to $5 adds $3; the shortfall of $48 divided by $3 gives the number of $5 notes."],
      "source": "Raffles 2024 P4 Weighted Assessment 1 Q14",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key = 16. (16 x $5 = $80, 19 x $2 = $38, total $118; 16 + 19 = 35.)"
    }
  ]
}