{
 "paper": {
  "school": "Ai Tong",
  "year": 2024,
  "level": "P4",
  "label": "Term 1 Review",
  "source_prefix": "Ai Tong 2024 P4 Term 1 Review",
  "has_answer_key": true
 },
 "questions": [
  {
   "n": 1,
   "type_id": 1,
   "question": "Write the number:<br>Fifty thousand, eight hundred and three.",
   "answer0": "50 803",
   "answer1": "5 803",
   "answer2": "50 083",
   "answer3": "508 003",
   "correct_answer": 0,
   "skill_id": 106,
   "difficulty_id": 1,
   "explanation": "Fifty thousand = 50 000, eight hundred = 800, three = 3. So the number is 50 000 + 800 + 3 = 50 803.",
   "hints": [
    "Fifty thousand is 50 000.",
    "Add the hundreds and ones: 50 000 + 800 + 3."
   ],
   "source": "Ai Tong 2024 P4 Term 1 Review Q1",
   "image_needed": false,
   "image_options": false,
   "image_file": null,
   "image_page": null,
   "image_bbox": null,
   "image_loc": null,
   "notes": "Word-to-numeral conversion converted to MCQ (word/numeral answers grade poorly as FIB). Key: 50803."
  },
  {
   "n": 2,
   "type_id": 2,
   "question": "Use all the digits to form the smallest 4-digit number.",
   "answer0": "5089",
   "answer1": null,
   "answer2": null,
   "answer3": null,
   "correct_answer": null,
   "skill_id": 107,
   "difficulty_id": 1,
   "explanation": "Digits are 5, 9, 0 and 8. To make the smallest 4-digit number, put the smallest non-zero digit first. 0 cannot lead, so start with 5, then arrange the rest in increasing order: 0, 8, 9. The smallest number is 5089.",
   "hints": [
    "A 4-digit number cannot start with 0.",
    "Use the smallest possible digit in the thousands place, then arrange the rest from small to large."
   ],
   "source": "Ai Tong 2024 P4 Term 1 Review Q2",
   "image_needed": true,
   "image_options": false,
   "image_file": "q2.png",
   "image_page": 1,
   "image_bbox": [
    0.16,
    0.62,
    0.7,
    0.74
   ],
   "image_loc": "train engine carrying four number carriages (5, 9, 0, 8), lower-left of page 1",
   "notes": "Digits shown only in the figure (5, 9, 0, 8). Key: 5089."
  },
  {
   "n": 3,
   "type_id": 2,
   "question": "Complete the number pattern.<br>74 603, 73 603, [?], 71 603, 70 603, [?]",
   "answer0": "72 603",
   "answer1": "69 603",
   "answer2": null,
   "answer3": null,
   "correct_answer": null,
   "skill_id": 108,
   "difficulty_id": 1,
   "explanation": "Each number decreases by 1000. After 73 603 comes 73 603 - 1000 = 72 603. After 70 603 comes 70 603 - 1000 = 69 603.",
   "hints": [
    "Find the difference between consecutive numbers.",
    "Each term is 1000 less than the one before it."
   ],
   "source": "Ai Tong 2024 P4 Term 1 Review Q3",
   "image_needed": false,
   "image_options": false,
   "image_file": null,
   "image_page": null,
   "image_bbox": null,
   "image_loc": null,
   "notes": "Key: 72603, 69603."
  },
  {
   "n": 4,
   "type_id": 2,
   "question": "Arrange the numbers in increasing order.<br>39 039, 40 390, 40 309, 39 309<br>[?], [?], [?], [?]",
   "answer0": "39 039",
   "answer1": "39 309",
   "answer2": "40 309",
   "answer3": "40 390",
   "correct_answer": null,
   "skill_id": 107,
   "difficulty_id": 2,
   "explanation": "Compare from the largest place value. 39 039 and 39 309 are in the 39-thousands; 39 039 < 39 309. 40 309 and 40 390 are in the 40-thousands; 40 309 < 40 390. Increasing order: 39 039, 39 309, 40 309, 40 390.",
   "hints": [
    "Group the numbers by their ten-thousands and thousands digits first.",
    "Then compare the remaining digits place by place."
   ],
   "source": "Ai Tong 2024 P4 Term 1 Review Q4",
   "image_needed": false,
   "image_options": false,
   "image_file": null,
   "image_page": null,
   "image_bbox": null,
   "image_loc": null,
   "notes": "Ordering task converted to FIB, one blank per position smallest to largest. Numbers given in text (decorative box only). Key: 39039, 39309, 40309, 40390."
  },
  {
   "n": 5,
   "type_id": 2,
   "question": "Round 74 945 to the nearest ten.<br>74 945 ≈ [?]<br>Round 74 945 to the nearest hundred.<br>74 945 ≈ [?]",
   "answer0": "74 950",
   "answer1": "74 900",
   "answer2": null,
   "answer3": null,
   "correct_answer": null,
   "skill_id": 109,
   "difficulty_id": 2,
   "explanation": "Nearest ten: the ones digit is 5, so round up the tens: 74 945 ≈ 74 950. Nearest hundred: the tens digit is 4 (less than 5), so round down: 74 945 ≈ 74 900.",
   "hints": [
    "To round to the nearest ten, look at the ones digit.",
    "To round to the nearest hundred, look at the tens digit; 5 or more rounds up."
   ],
   "source": "Ai Tong 2024 P4 Term 1 Review Q5",
   "image_needed": false,
   "image_options": false,
   "image_file": null,
   "image_page": null,
   "image_bbox": null,
   "image_loc": null,
   "notes": "Two-part rounding (5a and 5b) combined into a single two-blank FIB. Key: a) 74950, b) 74900."
  },
  {
   "n": 6,
   "type_id": 2,
   "question": "Peter listed the factors of 32: 1, 2, 4, 16, 32.<br>He missed out one factor. What is the missing factor?",
   "answer0": "8",
   "answer1": null,
   "answer2": null,
   "answer3": null,
   "correct_answer": null,
   "skill_id": 111,
   "difficulty_id": 2,
   "explanation": "The factors of 32 are 1, 2, 4, 8, 16, 32 (since 1×32, 2×16, 4×8). The list 1, 2, 4, 16, 32 leaves out 8, so the missing factor is 8.",
   "hints": [
    "List the factor pairs of 32.",
    "4 × ? = 32 gives the missing factor."
   ],
   "source": "Ai Tong 2024 P4 Term 1 Review Q6",
   "image_needed": true,
   "image_options": false,
   "image_file": "q6.png",
   "image_page": 3,
   "image_bbox": [
    0.13,
    0.09,
    0.75,
    0.21
   ],
   "image_loc": "row of five eggplant shapes labelled 1, 2, 4, 16, 32 near top of page 3",
   "notes": "Factors listed in the figure (eggplants). Key: 4 x 8 = 32, ANS 8."
  },
  {
   "n": 7,
   "type_id": 2,
   "question": "Circle the common multiples of 3 and 9.<br>6, 12, 18, 24, 27<br>[?], [?]",
   "answer0": "18",
   "answer1": "27",
   "answer2": null,
   "answer3": null,
   "correct_answer": null,
   "skill_id": 115,
   "difficulty_id": 2,
   "explanation": "A common multiple of 3 and 9 must be divisible by both. From 6, 12, 18, 24, 27: 18 = 9×2 and 27 = 9×3 are multiples of 9 (and of 3). 6, 12 and 24 are multiples of 3 but not of 9. Common multiples: 18 and 27.",
   "hints": [
    "A multiple of 9 is also a multiple of 3.",
    "Check which of the numbers are in the 9 times table."
   ],
   "source": "Ai Tong 2024 P4 Term 1 Review Q7",
   "image_needed": true,
   "image_options": false,
   "image_file": "q7.png",
   "image_page": 3,
   "image_bbox": [
    0.13,
    0.45,
    0.7,
    0.56
   ],
   "image_loc": "row of five leaf shapes labelled 6, 12, 18, 24, 27 in middle of page 3",
   "notes": "\"Circle\" task converted to FIB listing the common multiples. Numbers shown in figure (leaves). Key: 27, 18."
  },
  {
   "n": 8,
   "type_id": 2,
   "question": "A given number is a multiple of 7.<br>The number is between 50 and 60.<br>What is the number?",
   "answer0": "56",
   "answer1": null,
   "answer2": null,
   "answer3": null,
   "correct_answer": null,
   "skill_id": 114,
   "difficulty_id": 1,
   "explanation": "Multiples of 7: 49, 56, 63, ... The only one between 50 and 60 is 56 (7 × 8 = 56).",
   "hints": [
    "List the multiples of 7 near 50.",
    "7 × 8 = 56."
   ],
   "source": "Ai Tong 2024 P4 Term 1 Review Q8",
   "image_needed": false,
   "image_options": false,
   "image_file": null,
   "image_page": null,
   "image_bbox": null,
   "image_loc": null,
   "notes": "Key: 56."
  },
  {
   "n": 9,
   "type_id": 2,
   "question": "Arrange these fractions from the greatest to the smallest.<br>$$\\frac{2}{3}$$, $$\\frac{5}{6}$$, $$\\frac{2}{5}$$<br>[?], [?], [?]",
   "answer0": "5/6",
   "answer1": "2/3",
   "answer2": "2/5",
   "answer3": null,
   "correct_answer": null,
   "skill_id": 121,
   "difficulty_id": 2,
   "explanation": "Convert to a common denominator of 30: $$\\frac{2}{3}=\\frac{20}{30}$$, $$\\frac{5}{6}=\\frac{25}{30}$$, $$\\frac{2}{5}=\\frac{12}{30}$$. Greatest to smallest: $$\\frac{25}{30}, \\frac{20}{30}, \\frac{12}{30}$$, i.e. $$\\frac{5}{6}, \\frac{2}{3}, \\frac{2}{5}$$.",
   "hints": [
    "Rewrite the fractions with a common denominator.",
    "Use 30 as the common denominator and compare numerators."
   ],
   "source": "Ai Tong 2024 P4 Term 1 Review Q9",
   "image_needed": false,
   "image_options": false,
   "image_file": null,
   "image_page": null,
   "image_bbox": null,
   "image_loc": null,
   "notes": "Ordering task converted to FIB, greatest to smallest. FIB fraction answers kept plain a/b. Key: 5/6, 2/3, 2/5."
  },
  {
   "n": 10,
   "type_id": 2,
   "question": "Find the value of $$\\frac{11}{12}-\\frac{1}{4}$$.<br>Give your answer in its simplest form.",
   "answer0": "2/3",
   "answer1": null,
   "answer2": null,
   "answer3": null,
   "correct_answer": null,
   "skill_id": 121,
   "difficulty_id": 2,
   "explanation": "Make the denominators the same: $$\\frac{1}{4}=\\frac{3}{12}$$. Then $$\\frac{11}{12}-\\frac{3}{12}=\\frac{8}{12}$$. Simplify by dividing by 4: $$\\frac{8}{12}=\\frac{2}{3}$$.",
   "hints": [
    "Convert $$\\frac{1}{4}$$ to twelfths.",
    "Subtract the numerators, then simplify the result."
   ],
   "source": "Ai Tong 2024 P4 Term 1 Review Q10",
   "image_needed": false,
   "image_options": false,
   "image_file": null,
   "image_page": null,
   "image_bbox": null,
   "image_loc": null,
   "notes": "FIB fraction answer kept plain a/b. Key: 8/12 = 2/3."
  },
  {
   "n": 11,
   "type_id": 2,
   "question": "A shop had 162 boxes of mangoes. Each box had 36 mangoes.<br>(a) How many mangoes were there?<br>(b) The shop sold 738 mangoes. The rest of the mangoes were packed into bags of 9. How many bags of mangoes were packed?<br>(a) [?]<br>(b) [?]",
   "answer0": "5832",
   "answer1": "566",
   "answer2": null,
   "answer3": null,
   "correct_answer": null,
   "skill_id": 118,
   "difficulty_id": 2,
   "explanation": "(a) Total mangoes = 162 × 36 = 5832. (b) Mangoes left after selling = 5832 - 738 = 5094. Bags = 5094 ÷ 9 = 566.",
   "hints": [
    "Multiply boxes by mangoes per box for the total.",
    "Subtract the mangoes sold, then divide what is left by 9."
   ],
   "source": "Ai Tong 2024 P4 Term 1 Review Q11",
   "image_needed": false,
   "image_options": false,
   "image_file": null,
   "image_page": null,
   "image_bbox": null,
   "image_loc": null,
   "notes": "Two-part word problem combined into a two-blank FIB. Key: a) 162x36=5832; b) (5832-738)÷9 = 5094÷9 = 566."
  },
  {
   "n": 12,
   "type_id": 2,
   "question": "Sam had some game cards at first. He gave 238 cards to his brother. Then he received 648 new cards from his father. Sam had 1330 cards in the end.<br>How many game cards did he have at first?",
   "answer0": "920",
   "answer1": null,
   "answer2": null,
   "answer3": null,
   "correct_answer": null,
   "skill_id": 118,
   "difficulty_id": 2,
   "explanation": "Work backwards from the end. Before receiving 648: 1330 - 648 = 682. Before giving away 238: 682 + 238 = 920. So Sam had 920 cards at first.",
   "hints": [
    "Reverse each step: undo the cards received, then undo the cards given.",
    "1330 - 648, then add 238."
   ],
   "source": "Ai Tong 2024 P4 Term 1 Review Q12",
   "image_needed": false,
   "image_options": false,
   "image_file": null,
   "image_page": null,
   "image_bbox": null,
   "image_loc": null,
   "notes": "Key: 1330-648=682; 682+238=920."
  },
  {
   "n": 13,
   "type_id": 2,
   "question": "School A has 3064 story books in its library. School B has 4 times as many books as School A.<br>(a) How many more story books does School B have than School A?<br>(b) How many story books must be moved from School B to School A so that there will be the same number of books in both schools?<br>(a) [?]<br>(b) [?]",
   "answer0": "9192",
   "answer1": "4596",
   "answer2": null,
   "answer3": null,
   "correct_answer": null,
   "skill_id": 118,
   "difficulty_id": 2,
   "explanation": "School B = 3064 × 4 = 12 256 books. (a) More books in B than A = 12 256 - 3064 = 9192. (b) To make both equal, move half the difference: 9192 ÷ 2 = 4596 books.",
   "hints": [
    "Find School B's total first (4 times School A).",
    "The number to move is half the difference between the two schools."
   ],
   "source": "Ai Tong 2024 P4 Term 1 Review Q13",
   "image_needed": false,
   "image_options": false,
   "image_file": null,
   "image_page": null,
   "image_bbox": null,
   "image_loc": null,
   "notes": "Two-part word problem combined into a two-blank FIB. Key: a) 3064x4=12256, 12256-3064=9192; b) 9192÷2=4596."
  },
  {
   "n": 14,
   "type_id": 2,
   "question": "A green bulb blinks every 4 minutes, and a red bulb blinks every 6 minutes.<br>(a) How many times will the red bulb blink in 48 minutes?<br>(b) The two light bulbs blink together at 8.00 p.m. for the first time. At what time will the two bulbs blink together for the second time?<br>(a) [?]<br>(b) [?]",
   "answer0": "8",
   "answer1": "8.12 p.m.",
   "answer2": null,
   "answer3": null,
   "correct_answer": null,
   "skill_id": 115,
   "difficulty_id": 2,
   "explanation": "(a) The red bulb blinks every 6 minutes, so in 48 minutes it blinks 48 ÷ 6 = 8 times. (b) The bulbs blink together at multiples of the LCM of 4 and 6, which is 12 minutes. After 8.00 p.m., the next time they blink together is 12 minutes later, at 8.12 p.m.",
   "hints": [
    "For (a) divide 48 by 6.",
    "For (b) find the lowest common multiple of 4 and 6, then add that many minutes to 8.00 p.m."
   ],
   "source": "Ai Tong 2024 P4 Term 1 Review Q14",
   "image_needed": false,
   "image_options": false,
   "image_file": null,
   "image_page": null,
   "image_bbox": null,
   "image_loc": null,
   "notes": "Two-part problem combined into a two-blank FIB. Key: a) 48÷6=8; b) 8.12pm (LCM of 4,6 = 12 min)."
  }
 ]
}