{
  "paper": {
    "school": "Nanyang",
    "year": 2025,
    "level": "P3",
    "label": "Weighted Assessment 1",
    "source_prefix": "Nanyang 2025 P3 Weighted Assessment 1",
    "has_answer_key": true
  },
  "questions": [
    {
      "n": 1,
      "type_id": 1,
      "question": "Arrange the following numbers in decreasing order.\n9452     5924     9254",
      "answer0": "5924, 9452, 9254",
      "answer1": "5924, 9254, 9452",
      "answer2": "9254, 5924, 9452",
      "answer3": "9452, 9254, 5924",
      "correct_answer": 3,
      "skill_id": 69,
      "difficulty_id": 1,
      "explanation": "Decreasing order means largest first. Compare the thousands digit: 9452 and 9254 both start with 9, while 5924 starts with 5. Between 9452 and 9254, the hundreds digit 4 > 2, so 9452 > 9254. Order: 9452, 9254, 5924. Answer: option 4.",
      "hints": ["Decreasing order = from largest to smallest.", "Compare the thousands digit first, then hundreds, then tens."],
      "source": "Nanyang 2025 P3 Weighted Assessment 1 Q1",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: option 4."
    },
    {
      "n": 2,
      "type_id": 1,
      "question": "Find the sum of 3876 and 4149.",
      "answer0": "8025",
      "answer1": "7915",
      "answer2": "1733",
      "answer3": "273",
      "correct_answer": 0,
      "skill_id": 70,
      "difficulty_id": 1,
      "explanation": "Add: 3876 + 4149. 6+9=15 (write 5, carry 1); 7+4+1=12 (write 2, carry 1); 8+1+1=10 (write 0, carry 1); 3+4+1=8. Sum = 8025. Answer: option 1.",
      "hints": ["Sum means add the two numbers.", "Line up the digits by place value and add from the right, carrying over."],
      "source": "Nanyang 2025 P3 Weighted Assessment 1 Q2",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: option 1."
    },
    {
      "n": 3,
      "type_id": 1,
      "question": "There are 5 items. Kyan spent $18 on 3 different items. What did Kyan buy?\nbun $2.40, doughnut $5.80, muffin $5.40, sandwich $6.80, cake $11.20",
      "answer0": "sandwich and cake",
      "answer1": "bun, muffin and cake",
      "answer2": "bun, doughnut and sandwich",
      "answer3": "doughnut, muffin and sandwich",
      "correct_answer": 3,
      "skill_id": 83,
      "difficulty_id": 2,
      "explanation": "Kyan bought 3 different items totalling $18. Check option 4: doughnut $5.80 + muffin $5.40 + sandwich $6.80 = $18.00. The other options either have only 2 items or do not total $18. Answer: option 4.",
      "hints": ["Kyan bought exactly 3 items, so eliminate options with only 2 items.", "Add the three prices and check which set totals $18.00."],
      "source": "Nanyang 2025 P3 Weighted Assessment 1 Q3",
      "image_needed": true,
      "image_options": false,
      "image_file": "q3.png",
      "image_page": 2,
      "image_bbox": [0.27, 0.42, 0.88, 0.57],
      "image_loc": "row of 5 labelled item pictures with prices (bun, doughnut, muffin, sandwich, cake), middle of page",
      "notes": "Prices are listed in the stem; figure is the labelled picture row. Key: option 4."
    },
    {
      "n": 4,
      "type_id": 2,
      "question": "(a) Write four thousand and nine in numerals.\n[?]\n(b) Use all the digits 0, 7, 4, 3 to form the smallest 4-digit even number. Each digit can only be used once.\n[?]",
      "answer0": "4009",
      "answer1": "3074",
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 67,
      "difficulty_id": 2,
      "explanation": "(a) Four thousand = 4000, and nine = 9, so four thousand and nine = 4009. (b) For the smallest 4-digit even number, the last digit must be even (0 or 4). Use the smallest non-zero digit, 3, in the thousands place, then 0 in the hundreds. With 4 and 7 left, place them so the last digit is even: 3074 (even). 3074 is smaller than 3704. Answer: 3074.",
      "hints": ["(a) Four thousand is 4000; add the nine ones.", "(b) An even number ends in an even digit; put the smallest non-zero digit first and keep the number as small as possible."],
      "source": "Nanyang 2025 P3 Weighted Assessment 1 Q4",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Two-blank FIB (4a, 4b). Digit cards in (b) are decorative. Key: a) 4009, b) 3074."
    },
    {
      "n": 5,
      "type_id": 2,
      "question": "Study the number pattern. Find the missing number in the number pattern.\n1055, [?], 1105, 1130, 1155, 1180",
      "answer0": "1080",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 69,
      "difficulty_id": 1,
      "explanation": "The pattern increases by 25 each step (1105, 1130, 1155, 1180 differ by 25). The missing number = 1055 + 25 = 1080.",
      "hints": ["Find the constant difference between consecutive given numbers.", "Add that difference to 1055."],
      "source": "Nanyang 2025 P3 Weighted Assessment 1 Q5",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: 1080."
    },
    {
      "n": 6,
      "type_id": 2,
      "question": "Muthu bought a remote control car for $64.70 and a toy plane for $25.80. He had $8.60 left after buying the 2 items. How much money did Muthu have at first?",
      "answer0": "99.10",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 83,
      "difficulty_id": 2,
      "explanation": "Cost of the two items: $64.70 + $25.80 = $90.50. He had $8.60 left, so at first he had $90.50 + $8.60 = $99.10.",
      "hints": ["First add the two item prices together.", "Add the amount left over to find the starting amount."],
      "source": "Nanyang 2025 P3 Weighted Assessment 1 Q6",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Prices ($64.70, $25.80) are stated in the stem; the figure is just decorative car/plane pictures, not needed to solve. Answer $99.10 (FIB numeric, no $ sign). Key: $99.10."
    },
    {
      "n": 7,
      "type_id": 2,
      "question": "Li Hua spent $24 on some apples. She forgot to bring her own bag and had to pay $0.35 on plastic bags. How much change did she get when she gave the cashier $50?",
      "answer0": "25.65",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 83,
      "difficulty_id": 2,
      "explanation": "Total spent = $24 + $0.35 = $24.35. Change = $50 - $24.35 = $25.65. (Equivalently $50 - $24 = $26, then $26 - $0.35 = $25.65.)",
      "hints": ["Add the cost of the apples and the plastic bags first.", "Subtract the total spent from $50 to find the change."],
      "source": "Nanyang 2025 P3 Weighted Assessment 1 Q7",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Answer $25.65 (FIB numeric, no $ sign). Key: $25.65."
    },
    {
      "n": 8,
      "type_id": 2,
      "question": "Mary has 4 different coloured pencils. The 4 colours are red, blue, yellow and purple. She needs to choose 2 colours for her drawing. How many different ways can she choose the 2 colours?",
      "answer0": "6",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 76,
      "difficulty_id": 2,
      "explanation": "List the pairs: red-blue, red-yellow, red-purple (3); blue-yellow, blue-purple (2); yellow-purple (1). Total = 3 + 2 + 1 = 6 ways.",
      "hints": ["List the pairs systematically so none are repeated.", "Count pairs with red first, then blue, then yellow: 3 + 2 + 1."],
      "source": "Nanyang 2025 P3 Weighted Assessment 1 Q8",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Combinations / systematic listing. Key: 6."
    },
    {
      "n": 9,
      "type_id": 2,
      "question": "The difference between two numbers is 250. The greater number is 1184.\n(a) What is the smaller number?\n[?]\n(b) What is the sum of the two numbers?\n[?]",
      "answer0": "934",
      "answer1": "2118",
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 71,
      "difficulty_id": 2,
      "explanation": "(a) Smaller number = greater number - difference = 1184 - 250 = 934. (b) Sum = 934 + 1184 = 2118.",
      "hints": ["(a) Subtract the difference from the greater number.", "(b) Add the smaller number you found to the greater number."],
      "source": "Nanyang 2025 P3 Weighted Assessment 1 Q9",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Two-blank FIB (9a, 9b). Key: a) 934, b) 2118."
    }
  ]
}