{
  "paper": {
    "school": "Nan Hua",
    "year": 2025,
    "level": "P3",
    "label": "Weighted Assessment 1",
    "source_prefix": "Nan Hua 2025 P3 Weighted Assessment 1",
    "has_answer_key": true
  },
  "questions": [
    {
      "n": 1,
      "type_id": 1,
      "question": "In 9756, which digit is in the hundreds place?",
      "answer0": "9",
      "answer1": "7",
      "answer2": "6",
      "answer3": "5",
      "correct_answer": 1,
      "skill_id": 66,
      "difficulty_id": 1,
      "explanation": "Read place values from the right: 6 ones, 5 tens, 7 hundreds, 9 thousands. The digit in the hundreds place is 7.",
      "hints": ["The places from the right are ones, tens, hundreds, thousands.", "Count three places in from the right: 6 (ones), 5 (tens), 7 (hundreds)."],
      "source": "Nan Hua 2025 P3 Weighted Assessment 1 Q1",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: option 2 (7)."
    },
    {
      "n": 2,
      "type_id": 1,
      "question": "6000 + 700 + 4 has the same value as [?].",
      "answer0": "674",
      "answer1": "6074",
      "answer2": "6704",
      "answer3": "6740",
      "correct_answer": 2,
      "skill_id": 66,
      "difficulty_id": 1,
      "explanation": "Add the expanded parts: 6000 + 700 + 4 = 6704. There are no tens, so the tens digit is 0.",
      "hints": ["Line up by place value: thousands, hundreds, tens, ones.", "There is no tens part, so put 0 in the tens place: 6704."],
      "source": "Nan Hua 2025 P3 Weighted Assessment 1 Q2",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: option 3 (6704). Verbatim stem keeps the blank as printed."
    },
    {
      "n": 3,
      "type_id": 1,
      "question": "Lily has some money. After her mother gave her $3.60. She had $13. How much did she have at first?",
      "answer0": "$9.40",
      "answer1": "$10.40",
      "answer2": "$10.60",
      "answer3": "$16.60",
      "correct_answer": 0,
      "skill_id": 83,
      "difficulty_id": 2,
      "explanation": "She ended with $13 after receiving $3.60, so at first she had $13 - $3.60 = $9.40.",
      "hints": ["The $3.60 was added on, so work backwards by subtracting it.", "$13.00 - $3.60 = $9.40."],
      "source": "Nan Hua 2025 P3 Weighted Assessment 1 Q3",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: option 1 ($9.40). Stem transcribed verbatim including the printed full stop after $3.60."
    },
    {
      "n": 4,
      "type_id": 1,
      "question": "4 thousands 12 hundreds 9 tens 6 ones is the same as [?]",
      "answer0": "4196",
      "answer1": "4296",
      "answer2": "5196",
      "answer3": "5296",
      "correct_answer": 3,
      "skill_id": 66,
      "difficulty_id": 2,
      "explanation": "4 thousands = 4000, 12 hundreds = 1200, 9 tens = 90, 6 ones = 6. Total = 4000 + 1200 + 90 + 6 = 5296.",
      "hints": ["12 hundreds is more than 9 hundreds; it equals 1200.", "Add 4000 + 1200 + 90 + 6 = 5296."],
      "source": "Nan Hua 2025 P3 Weighted Assessment 1 Q4",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: option 4 (5296)."
    },
    {
      "n": 5,
      "type_id": 1,
      "question": "Complete the number pattern. 2513, 2523, 2543, 2553, 2573, 2583, [?]",
      "answer0": "2584",
      "answer1": "2593",
      "answer2": "2603",
      "answer3": "2613",
      "correct_answer": 2,
      "skill_id": 69,
      "difficulty_id": 2,
      "explanation": "The numbers go up alternately by 10 then 20: 2513 (+10) 2523 (+20) 2543 (+10) 2553 (+20) 2573 (+10) 2583 (+20) 2603. The next number is 2603.",
      "hints": ["Find the gap between each pair: it alternates +10, +20.", "After 2583 the next step is +20, giving 2603."],
      "source": "Nan Hua 2025 P3 Weighted Assessment 1 Q5",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: option 3 (2603)."
    },
    {
      "n": 6,
      "type_id": 1,
      "question": "The difference between two numbers is 389. The bigger number is 711. What is the smaller number?",
      "answer0": "322",
      "answer1": "432",
      "answer2": "1000",
      "answer3": "1100",
      "correct_answer": 0,
      "skill_id": 71,
      "difficulty_id": 2,
      "explanation": "Difference = bigger - smaller, so smaller = bigger - difference = 711 - 389 = 322.",
      "hints": ["Smaller number = bigger number - the difference.", "711 - 389 = 322."],
      "source": "Nan Hua 2025 P3 Weighted Assessment 1 Q6",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: option 1 (322)."
    },
    {
      "n": 7,
      "type_id": 2,
      "question": "Arrange the numbers in increasing order. 1094, 1904, 1940, 1049 [?], [?], [?], [?]",
      "answer0": "1049",
      "answer1": "1094",
      "answer2": "1904",
      "answer3": "1940",
      "correct_answer": null,
      "skill_id": 68,
      "difficulty_id": 2,
      "explanation": "Compare digit by digit from the thousands. All start with 1. Compare hundreds: 1049 and 1094 have 0; 1904 and 1940 have 9. Among 1049 and 1094, the tens decide: 1049 < 1094. Among 1904 and 1940: 1904 < 1940. Increasing order: 1049, 1094, 1904, 1940.",
      "hints": ["Increasing means smallest to largest.", "Compare place by place from the left: 1049, 1094, 1904, 1940."],
      "source": "Nan Hua 2025 P3 Weighted Assessment 1 Q7",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Ordering task converted to a 4-blank FIB in increasing order. Key: 1049, 1094, 1904, 1940."
    },
    {
      "n": 8,
      "type_id": 1,
      "question": "A pencil costs $3. Andy has $12, two 50-cent coins, one 50-cent coin and three 20-cent coins. Ben has some notes and coins. Who has enough money to buy the pencil?",
      "answer0": "Andy",
      "answer1": "Ben",
      "answer2": "Both Andy and Ben",
      "answer3": "Neither Andy nor Ben",
      "correct_answer": 0,
      "skill_id": 83,
      "difficulty_id": 2,
      "explanation": "Add up each person's money and compare with $3. Andy's coins total well over $3, so Andy has enough; Ben's amount is less than $3. Only Andy can buy the pencil.",
      "hints": ["Total each person's notes and coins.", "Compare each total with the $3 price."],
      "source": "Nan Hua 2025 P3 Weighted Assessment 1 Q8",
      "image_needed": true,
      "image_options": false,
      "image_file": "q8.png",
      "image_page": 4,
      "image_bbox": [0.24, 0.43, 0.66, 0.55],
      "image_loc": "Two-row table (Andy / Ben) of coin and note pictures, upper-middle of page",
      "notes": "Key: Andy. Original was a tick-the-box(es) task; converted to MCQ (who has enough). The money images for Andy and Ben are scanned coin/note pictures and must be cropped to read amounts. Image required to determine each total."
    },
    {
      "n": 9,
      "type_id": 2,
      "question": "What is the missing number in the box? 4 [?] 2 0 - 9 6 3 = 3 2 5 7",
      "answer0": "2",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 71,
      "difficulty_id": 2,
      "explanation": "The minuend is 4_20 with one missing digit. Add the difference and subtrahend: 3257 + 963 = 4220. So the four-digit number is 4220 and the missing (hundreds) digit is 2.",
      "hints": ["Whole = difference + amount subtracted: 3257 + 963.", "3257 + 963 = 4220, so the box (hundreds digit) is 2."],
      "source": "Nan Hua 2025 P3 Weighted Assessment 1 Q9",
      "image_needed": true,
      "image_options": false,
      "image_file": "q9.png",
      "image_page": 4,
      "image_bbox": [0.33, 0.63, 0.55, 0.78],
      "image_loc": "Vertical subtraction sum (4 [box] 2 0 minus 9 6 3 = 3 2 5 7), centre-lower of page",
      "notes": "Key: 2. The box is the hundreds digit of the top number; single missing digit. Vertical-sum figure recorded for cropping (the layout/alignment is the figure)."
    },
    {
      "n": 10,
      "type_id": 2,
      "question": "Joe bought a tie for $19.90 and a gift for $8.50. He had $4 left. How much did he have at first? [?]",
      "answer0": "$32.40",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 83,
      "difficulty_id": 2,
      "explanation": "At first money = total spent + money left. Spent = $19.90 + $8.50 = $28.40. Add the $4 left: $28.40 + $4 = $32.40.",
      "hints": ["Add up everything he spent first.", "$19.90 + $8.50 = $28.40, then add the $4 left over: $32.40."],
      "source": "Nan Hua 2025 P3 Weighted Assessment 1 Q10",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key working: $19.90 + $8.50 = $28.40; $28.40 + $4 = $32.40. Answer $32.40."
    },
    {
      "n": 11,
      "type_id": 2,
      "question": "There were 1450 brownies and scouts at a uniformed camp. 794 of them were scouts. How many more scouts than brownies were in the camp? [?]",
      "answer0": "138",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 71,
      "difficulty_id": 3,
      "explanation": "Number of brownies = 1450 - 794 = 656. More scouts than brownies = 794 - 656 = 138.",
      "hints": ["Find the brownies first: total minus scouts.", "1450 - 794 = 656 brownies, then 794 - 656 = 138."],
      "source": "Nan Hua 2025 P3 Weighted Assessment 1 Q11",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key working: 1450 - 794 = 656; 794 - 656 = 138. Answer 138."
    }
  ]
}