{
  "paper": {
    "school": "Nan Hua Primary School",
    "year": 2024,
    "level": "P4",
    "label": "Term 1 Review",
    "source_prefix": "Nan Hua 2024 P4 Term 1 Review",
    "has_answer_key": true
  },
  "questions": [
    {
      "n": 1,
      "type_id": 1,
      "question": "Which of the following is thirteen thousand, eight hundred and fifty in numerals?",
      "answer0": "13 085",
      "answer1": "13 805",
      "answer2": "13 850",
      "answer3": "30 850",
      "correct_answer": 2,
      "skill_id": 105,
      "difficulty_id": 1,
      "explanation": "Thirteen thousand = 13 000, eight hundred = 800, fifty = 50. 13 000 + 800 + 50 = 13 850.",
      "hints": ["Break it into thousands, hundreds, tens and ones.", "13 thousand is 13 000; add 850."],
      "source": "Nan Hua 2024 P4 Term 1 Review Q1",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: option 3 (13 850)."
    },
    {
      "n": 2,
      "type_id": 1,
      "question": "Arrange the following numbers from the smallest to the greatest.<br>47 209, 46 327, 46 825",
      "answer0": "47 209 , 46 825 , 46 327",
      "answer1": "47 209 , 46 327 , 46 825",
      "answer2": "46 825 , 47 209 , 46 327",
      "answer3": "46 327 , 46 825 , 47 209",
      "correct_answer": 3,
      "skill_id": 107,
      "difficulty_id": 1,
      "explanation": "Compare from the highest place value. Ten-thousands all 4; thousands: 46 327 and 46 825 have 6, 47 209 has 7, so 47 209 is largest. Between 46 327 and 46 825, hundreds 3 < 8, so 46 327 < 46 825. Smallest to greatest: 46 327, 46 825, 47 209.",
      "hints": ["Compare the digits from left (largest place value) first.", "Two numbers start with 46; one starts with 47."],
      "source": "Nan Hua 2024 P4 Term 1 Review Q2",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: option 4 (46 327, 46 825, 47 209)."
    },
    {
      "n": 3,
      "type_id": 1,
      "question": "In the following number pattern, what is the missing number?<br>12 878, 12 978, 13 978, 14 078, 15 078, [?], 16 178, 16 278",
      "answer0": "16 078",
      "answer1": "15 178",
      "answer2": "15 079",
      "answer3": "14 978",
      "correct_answer": 1,
      "skill_id": 108,
      "difficulty_id": 2,
      "explanation": "The pattern alternates +100 then +1000: 12 878 (+100) 12 978 (+1000) 13 978 (+100) 14 078 (+1000) 15 078 (+100) 15 178 (+1000) 16 178 (+100) 16 278. The missing number is 15 078 + 100 = 15 178.",
      "hints": ["Look at the difference between each pair of numbers.", "The steps alternate between adding 100 and adding 1000."],
      "source": "Nan Hua 2024 P4 Term 1 Review Q3",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Question shows a blank in the sequence; rendered as [?]. Key: option 2 (15 178)."
    },
    {
      "n": 4,
      "type_id": 1,
      "question": "Round 39 565 to the nearest thousand.",
      "answer0": "39 000",
      "answer1": "39 500",
      "answer2": "39 600",
      "answer3": "40 000",
      "correct_answer": 3,
      "skill_id": 109,
      "difficulty_id": 1,
      "explanation": "The hundreds digit is 5, so round up. 39 565 rounds up to 40 000 to the nearest thousand.",
      "hints": ["Look at the hundreds digit to decide round up or down.", "5 or more rounds up."],
      "source": "Nan Hua 2024 P4 Term 1 Review Q4",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: option 4 (40 000)."
    },
    {
      "n": 5,
      "type_id": 1,
      "question": "3 and 4 are factors of [?].",
      "answer0": "15",
      "answer1": "24",
      "answer2": "32",
      "answer3": "38",
      "correct_answer": 1,
      "skill_id": 111,
      "difficulty_id": 1,
      "explanation": "A number with both 3 and 4 as factors must be divisible by both. 24 = 3 × 8 = 4 × 6, so both 3 and 4 divide 24. (15 not divisible by 4; 32 not by 3; 38 not by 3 or 4.)",
      "hints": ["Test which option both 3 and 4 divide exactly.", "The number must be in both the 3 and 4 times tables."],
      "source": "Nan Hua 2024 P4 Term 1 Review Q5",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Original printed with a blank; rendered as [?] in stem. Key: option 2 (24)."
    },
    {
      "n": 6,
      "type_id": 1,
      "question": "Which of the following number is a common multiple of 6 and 9?",
      "answer0": "16",
      "answer1": "36",
      "answer2": "42",
      "answer3": "63",
      "correct_answer": 1,
      "skill_id": 115,
      "difficulty_id": 2,
      "explanation": "A common multiple of 6 and 9 must be in both times tables. 36 = 6 × 6 = 9 × 4, so 36 is a multiple of both. (16 is neither; 42 = 6×7 but not a multiple of 9; 63 = 9×7 but not a multiple of 6.)",
      "hints": ["List multiples of 6 and multiples of 9, then find one in both lists.", "The lowest common multiple of 6 and 9 is 18."],
      "source": "Nan Hua 2024 P4 Term 1 Review Q6",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: option 2 (36)."
    },
    {
      "n": 7,
      "type_id": 2,
      "question": "Mary had 3986 erasers. She gave 2013 erasers to her brother and 750 erasers to her sister. How many erasers had she left?",
      "answer0": "1223",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 118,
      "difficulty_id": 2,
      "explanation": "Erasers given away: 3986 - 2013 = 1973. Then 1973 - 750 = 1223. Mary had 1223 erasers left.",
      "hints": ["Subtract the erasers given to the brother first.", "Then subtract the erasers given to the sister."],
      "source": "Nan Hua 2024 P4 Term 1 Review Q7",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key working: 3986-2013=1973; 1973-750=1223."
    },
    {
      "n": 8,
      "type_id": 2,
      "question": "Mr Ahmad spends $346 each month. He spends the same amount of money each month. How much money does he spend in seven months?",
      "answer0": "$2422",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 116,
      "difficulty_id": 2,
      "explanation": "Multiply the monthly amount by the number of months: 346 × 7 = 2422. He spends $2422 in seven months.",
      "hints": ["Same amount each month means multiply.", "346 × 7."],
      "source": "Nan Hua 2024 P4 Term 1 Review Q8",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Answer space prints '$'; Key: 346x7=2422."
    },
    {
      "n": 9,
      "type_id": 2,
      "question": "(a) Find the value of 1028 ÷ 4<br>(b) Find the product of 45 and 12",
      "answer0": "257",
      "answer1": "540",
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 116,
      "difficulty_id": 2,
      "explanation": "(a) 1028 ÷ 4 = 257. (b) Product means multiply: 45 × 12 = 540.",
      "hints": ["(a) Divide 1028 by 4.", "(b) 'Product' means multiply 45 by 12."],
      "source": "Nan Hua 2024 P4 Term 1 Review Q9",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Two-part computation. answer0 = part (a) 257, answer1 = part (b) 540. Key: 1028÷4=257; 45x12=540."
    },
    {
      "n": 10,
      "type_id": 2,
      "question": "The sum of two numbers is 7293. The greater number is 5485. What is the smaller number?",
      "answer0": "1808",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 118,
      "difficulty_id": 2,
      "explanation": "Smaller number = total - greater number = 7293 - 5485 = 1808.",
      "hints": ["The two numbers add up to 7293.", "Subtract the greater number from the sum."],
      "source": "Nan Hua 2024 P4 Term 1 Review Q10",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: 7293-5485=1808."
    },
    {
      "n": 11,
      "type_id": 2,
      "question": "30 012 people visited an exhibition. 22 800 of them were adults and the rest were children.<br>(a) How many children visited the exhibition?<br>(b) 10 740 women visited the exhibition. How many children and women visited the exhibition?",
      "answer0": "7212",
      "answer1": "17 952",
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 118,
      "difficulty_id": 2,
      "explanation": "(a) Children = total - adults = 30 012 - 22 800 = 7212. (b) Children and women = 7212 + 10 740 = 17 952.",
      "hints": ["(a) Subtract the adults from the total number of people.", "(b) Add the number of women to the number of children."],
      "source": "Nan Hua 2024 P4 Term 1 Review Q11",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Two-part. answer0 = (a) 7212, answer1 = (b) 17 952. Key: 30012-22800=7212; 10740+7212=17952."
    },
    {
      "n": 12,
      "type_id": 2,
      "question": "Shop A had 126 boxes of oranges. There were 36 oranges in each box. The shop owner packed the oranges into bags of 8. How many bags of 8 oranges were there?",
      "answer0": "567",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 118,
      "difficulty_id": 3,
      "explanation": "Total oranges = 126 × 36 = 4536. Number of bags = 4536 ÷ 8 = 567. There were 567 bags.",
      "hints": ["First find the total number of oranges.", "Then divide the total by 8 to find the number of bags."],
      "source": "Nan Hua 2024 P4 Term 1 Review Q12",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: 126x36=4536; 4536÷8=567."
    },
    {
      "n": 13,
      "type_id": 2,
      "question": "A watch costs four times as much as a bag. Mr Tan paid $728 for a watch and three bags. How much did the watch cost?",
      "answer0": "$416",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 118,
      "difficulty_id": 3,
      "explanation": "Let 1 bag be 1 unit. Watch = 4 units. Watch + 3 bags = 4 + 3 = 7 units = $728. So 1 unit (1 bag) = 728 ÷ 7 = $104. Watch = 4 × 104 = $416.",
      "hints": ["Draw the watch as 4 equal units and each bag as 1 unit.", "Watch + 3 bags = 7 units = $728; find 1 unit first."],
      "source": "Nan Hua 2024 P4 Term 1 Review Q13",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: 728÷7=104; 104x4=416."
    }
  ]
}