{
  "paper": {
    "school": "Ai Tong",
    "year": 2025,
    "level": "P3",
    "label": "Weighted Assessment 2",
    "source_prefix": "Ai Tong 2025 P3 Weighted Assessment 2",
    "has_answer_key": true
  },
  "questions": [
    {
      "n": 1,
      "type_id": 2,
      "question": "Find the value of 102 × 4.",
      "answer0": "408",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 75,
      "difficulty_id": 1,
      "explanation": "Multiply: 102 × 4 = 408. (100 × 4 = 400, 2 × 4 = 8, 400 + 8 = 408.)",
      "hints": ["Split 102 into 100 + 2.", "Multiply each part by 4 and add."],
      "source": "Ai Tong 2025 P3 Weighted Assessment 2 Q1",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: 408."
    },
    {
      "n": 2,
      "type_id": 2,
      "question": "What is 96 ÷ 6?",
      "answer0": "16",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 75,
      "difficulty_id": 1,
      "explanation": "Divide: 96 ÷ 6 = 16. (60 ÷ 6 = 10, 36 ÷ 6 = 6, 10 + 6 = 16.)",
      "hints": ["Break 96 into 60 + 36.", "Divide each part by 6."],
      "source": "Ai Tong 2025 P3 Weighted Assessment 2 Q2",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: 16."
    },
    {
      "n": 3,
      "type_id": 1,
      "question": "In the figure, which angle is an obtuse angle?",
      "answer0": "Angle a",
      "answer1": "Angle b",
      "answer2": "Angle c",
      "answer3": "Angle d",
      "correct_answer": 1,
      "skill_id": 99,
      "difficulty_id": 2,
      "explanation": "An obtuse angle is larger than a right angle (more than 90°). In the quadrilateral, angle b is the widest angle, greater than a right angle, so it is the obtuse angle.",
      "hints": ["An obtuse angle is bigger than a right angle (a square corner).", "Compare each marked angle to a right angle and pick the widest one."],
      "source": "Ai Tong 2025 P3 Weighted Assessment 2 Q3",
      "image_needed": true,
      "image_options": false,
      "image_file": "q3.png",
      "image_page": 2,
      "image_bbox": [0.20, 0.13, 0.58, 0.40],
      "image_loc": "quadrilateral with angles a, b, c, d marked, upper-left of page",
      "notes": "Key: Angle B."
    },
    {
      "n": 4,
      "type_id": 1,
      "question": "Which of the letters has a pair of perpendicular lines?",
      "answer0": "A",
      "answer1": "L",
      "answer2": "K",
      "answer3": "Z",
      "correct_answer": 1,
      "skill_id": 100,
      "difficulty_id": 1,
      "explanation": "Perpendicular lines meet at a right angle (90°). The letter L is made of a vertical and a horizontal line that meet at a right angle, so L has a pair of perpendicular lines.",
      "hints": ["Perpendicular lines cross or meet at a right angle.", "Look for a letter with a clean square corner."],
      "source": "Ai Tong 2025 P3 Weighted Assessment 2 Q4",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: L. Options are letters A L K O Z; rendered as MCQ text options."
    },
    {
      "n": 5,
      "type_id": 1,
      "question": "Study the diagram. Name a pair of parallel lines.",
      "answer0": "AB and EF",
      "answer1": "AB and GH",
      "answer2": "GH and IJ",
      "answer3": "CD and GH",
      "correct_answer": 0,
      "skill_id": 100,
      "difficulty_id": 2,
      "explanation": "Parallel lines never meet and stay the same distance apart. Lines AB and EF run in the same direction and do not cross, so AB // EF.",
      "hints": ["Parallel lines point the same way and never meet.", "Lines AB, CD and EF all slope the same way; pick a pair that does not cross the slanted GH/IJ lines."],
      "source": "Ai Tong 2025 P3 Weighted Assessment 2 Q5",
      "image_needed": true,
      "image_options": false,
      "image_file": "q5.png",
      "image_page": 3,
      "image_bbox": [0.18, 0.18, 0.78, 0.50],
      "image_loc": "diagram of labelled lines A-B, C-D, E-F crossed by G-H and the J line, upper-middle of page",
      "notes": "Key: AB // EF. Distractors authored; only AB//EF is correct."
    },
    {
      "n": 6,
      "type_id": 1,
      "question": "The graph shows the number of students in Classes 3A, 3B and 3C. Which class has more boys than girls?",
      "answer0": "Class 3A",
      "answer1": "Class 3B",
      "answer2": "Class 3C",
      "answer3": "None of the classes",
      "correct_answer": 0,
      "skill_id": 102,
      "difficulty_id": 2,
      "explanation": "Read the bars for each class. In Class 3A the Boys bar (about 24) is taller than the Girls bar (about 12), so Class 3A has more boys than girls. In 3B and 3C the girls' bars are taller.",
      "hints": ["Compare the Girls bar and the Boys bar within each class.", "Find the class where the Boys bar is taller than the Girls bar."],
      "source": "Ai Tong 2025 P3 Weighted Assessment 2 Q6(a)",
      "image_needed": true,
      "image_options": false,
      "image_file": "q6.png",
      "image_page": 4,
      "image_bbox": [0.10, 0.17, 0.92, 0.52],
      "image_loc": "double bar graph (Girls/Boys) for Class 3A, 3B, 3C, upper half of page",
      "notes": "Key Q6 a): 3A. Same graph image used for Q6(a) and Q6(b)."
    },
    {
      "n": 6,
      "type_id": 2,
      "question": "The graph shows the number of students in Classes 3A, 3B and 3C. How many girls are there in Class 3C?",
      "answer0": "16",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 102,
      "difficulty_id": 2,
      "explanation": "Read the Girls bar for Class 3C. The shaded (Girls) bar for 3C reaches the 16 mark, so there are 16 girls in Class 3C.",
      "hints": ["Find the Class 3C group on the graph.", "Read the height of the shaded Girls bar against the scale."],
      "source": "Ai Tong 2025 P3 Weighted Assessment 2 Q6(b)",
      "image_needed": true,
      "image_options": false,
      "image_file": "q6.png",
      "image_page": 4,
      "image_bbox": [0.10, 0.17, 0.92, 0.52],
      "image_loc": "double bar graph (Girls/Boys) for Class 3A, 3B, 3C, upper half of page",
      "notes": "ANSWER-KEY DISCREPANCY: printed key shows '46', which is impossible (graph scale maxes at 30). Class 3C Girls bar reads 16; using 16 per the graph. Flag for human QA. Same image as Q6(a)."
    },
    {
      "n": 7,
      "type_id": 2,
      "question": "48 pens were packed into 8 equal boxes. How many pens were there in each box?",
      "answer0": "6",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 76,
      "difficulty_id": 1,
      "explanation": "Equal sharing: 48 ÷ 8 = 6. There were 6 pens in each box.",
      "hints": ["Equal boxes means divide.", "48 ÷ 8 = ?"],
      "source": "Ai Tong 2025 P3 Weighted Assessment 2 Q7",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: 48 ÷ 8 = 6."
    },
    {
      "n": 8,
      "type_id": 2,
      "question": "What is the product of 9 and 205?",
      "answer0": "1845",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 75,
      "difficulty_id": 2,
      "explanation": "Product means multiply: 205 × 9 = 1845. (200 × 9 = 1800, 5 × 9 = 45, 1800 + 45 = 1845.)",
      "hints": ["'Product' means multiply the two numbers.", "Split 205 into 200 + 5 and multiply each by 9."],
      "source": "Ai Tong 2025 P3 Weighted Assessment 2 Q8",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: 205 × 9 = 1845."
    },
    {
      "n": 9,
      "type_id": 2,
      "question": "Henry collected 125 coins. He collected 5 times as many coins as Gina. How many coins did Gina collect?",
      "answer0": "25",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 76,
      "difficulty_id": 2,
      "explanation": "Henry has 5 times Gina's amount, so Gina = 125 ÷ 5 = 25. Gina collected 25 coins.",
      "hints": ["Henry's coins are 5 equal units; Gina is 1 unit.", "Divide Henry's total by 5."],
      "source": "Ai Tong 2025 P3 Weighted Assessment 2 Q9",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: 125 ÷ 5 = 25."
    },
    {
      "n": 10,
      "type_id": 2,
      "question": "When a number is divided by 3, the quotient is 46 and the remainder is 2. What is the number?",
      "answer0": "140",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 74,
      "difficulty_id": 2,
      "explanation": "Number = quotient × divisor + remainder = 46 × 3 + 2 = 138 + 2 = 140.",
      "hints": ["Number = quotient × divisor + remainder.", "Work out 46 × 3, then add the remainder 2."],
      "source": "Ai Tong 2025 P3 Weighted Assessment 2 Q10",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: 46 × 3 = 138; 138 + 2 = 140."
    },
    {
      "n": 11,
      "type_id": 2,
      "question": "Ahmad bought 1263 yellow beads. He bought 200 more red beads than yellow beads. How many beads did he buy altogether?",
      "answer0": "2726",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 71,
      "difficulty_id": 2,
      "explanation": "Red beads = 1263 + 200 = 1463. Altogether = yellow + red = 1263 + 1463 = 2726 beads.",
      "hints": ["First find the number of red beads (200 more than yellow).", "Add the yellow and red beads together."],
      "source": "Ai Tong 2025 P3 Weighted Assessment 2 Q11",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: 1263 + 200 = 1463; 1463 + 1263 = 2726."
    },
    {
      "n": 12,
      "type_id": 0,
      "question": "Draw a line perpendicular to AB that passes through Point X.",
      "answer0": null,
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 101,
      "difficulty_id": 2,
      "explanation": "On the square grid, draw a straight line through Point X that meets line AB at a right angle (90°). The answer-key diagram shows the perpendicular drawn from X meeting AB.",
      "hints": ["Perpendicular means it must cross AB at a right angle.", "Use the grid squares to keep the new line at 90° to AB."],
      "source": "Ai Tong 2025 P3 Weighted Assessment 2 Q12",
      "image_needed": true,
      "image_options": false,
      "image_file": "q12.png",
      "image_page": 7,
      "image_bbox": [0.17, 0.42, 0.65, 0.80],
      "image_loc": "square grid with diagonal line A-B and Point X marked, lower half of page",
      "notes": "Interactive draw task (type_id 0, skipped on insert). Key: perpendicular line drawn from X meeting AB at right angle."
    },
    {
      "n": 13,
      "type_id": 1,
      "question": "The graph shows the number of stickers 5 children collected. Who collected twice as many stickers as Aminah?",
      "answer0": "James",
      "answer1": "Kelly",
      "answer2": "Mary",
      "answer3": "Dylan",
      "correct_answer": 0,
      "skill_id": 104,
      "difficulty_id": 2,
      "explanation": "Aminah collected 40 stickers. Twice as many is 40 × 2 = 80. James collected 80 stickers, so James collected twice as many as Aminah.",
      "hints": ["Read Aminah's bar first.", "Double Aminah's value, then find whose bar matches that height."],
      "source": "Ai Tong 2025 P3 Weighted Assessment 2 Q13(a)",
      "image_needed": true,
      "image_options": false,
      "image_file": "q13.png",
      "image_page": 8,
      "image_bbox": [0.18, 0.27, 0.80, 0.52],
      "image_loc": "bar graph of stickers for James, Kelly, Mary, Aminah, Dylan, upper-middle of page",
      "notes": "Key Q13 a): 40 × 2 = 80, Ans: James. Same image used for Q13(b)."
    },
    {
      "n": 13,
      "type_id": 2,
      "question": "The graph shows the number of stickers 5 children collected. How many stickers must Kelly collect so that she has the same number of stickers as Mary?",
      "answer0": "40",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 104,
      "difficulty_id": 2,
      "explanation": "Mary collected 90 stickers and Kelly collected 50. Kelly needs 90 − 50 = 40 more stickers to match Mary.",
      "hints": ["Read Mary's and Kelly's bars.", "Find the difference: Mary's total minus Kelly's total."],
      "source": "Ai Tong 2025 P3 Weighted Assessment 2 Q13(b)",
      "image_needed": true,
      "image_options": false,
      "image_file": "q13.png",
      "image_page": 8,
      "image_bbox": [0.18, 0.27, 0.80, 0.52],
      "image_loc": "bar graph of stickers for James, Kelly, Mary, Aminah, Dylan, upper-middle of page",
      "notes": "Key Q13 b): 90 − 50 = 40. Same image as Q13(a)."
    },
    {
      "n": 14,
      "type_id": 2,
      "question": "Mrs Lim bought 2 identical watches and 3 identical necklaces. Each watch cost $51. 2 watches cost as much as 3 necklaces. How much did Mrs Lim pay for the 2 watches?",
      "answer0": "102",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 83,
      "difficulty_id": 2,
      "explanation": "Each watch cost $51, so 2 watches = 51 × 2 = $102.",
      "hints": ["Each watch is $51.", "Multiply $51 by 2 for two watches."],
      "source": "Ai Tong 2025 P3 Weighted Assessment 2 Q14(a)",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key Q14 a): 51 + 51 = $102. Answer in dollars."
    },
    {
      "n": 14,
      "type_id": 2,
      "question": "Mrs Lim bought 2 identical watches and 3 identical necklaces. Each watch cost $51. 2 watches cost as much as 3 necklaces. What was the cost of 1 necklace?",
      "answer0": "34",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 83,
      "difficulty_id": 3,
      "explanation": "2 watches cost $102, and 3 necklaces cost as much as 2 watches, so 3 necklaces = $102. One necklace = 102 ÷ 3 = $34.",
      "hints": ["3 necklaces cost the same as 2 watches = $102.", "Divide $102 by 3 to find one necklace."],
      "source": "Ai Tong 2025 P3 Weighted Assessment 2 Q14(b)",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key Q14 b): 102 ÷ 3 = $34. Answer in dollars."
    },
    {
      "n": 15,
      "type_id": 2,
      "question": "A bakery is having a sale. For every 3 muffins a customer buys, he will get another muffin free. 3 muffins cost $5. Li Min has $5. How many muffins can Li Min get with all her money?",
      "answer0": "4",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 83,
      "difficulty_id": 2,
      "explanation": "With $5 Li Min buys 3 muffins, and the offer gives 1 free muffin. So she gets 3 + 1 = 4 muffins.",
      "hints": ["$5 buys 3 muffins.", "Add the 1 free muffin from the offer."],
      "source": "Ai Tong 2025 P3 Weighted Assessment 2 Q15(a)",
      "image_needed": true,
      "image_options": false,
      "image_file": "q15.png",
      "image_page": 10,
      "image_bbox": [0.18, 0.15, 0.82, 0.40],
      "image_loc": "'Sale! 3 for $5 / Buy 3 muffins and get 1 muffin free!' poster with muffin pictures, upper part of page",
      "notes": "Key Q15 a): 3 + 1 = 4 muffins. Same poster image used for Q15(b)."
    },
    {
      "n": 15,
      "type_id": 2,
      "question": "A bakery is having a sale. For every 3 muffins a customer buys, he will get another muffin free. 3 muffins cost $5. David wants to get 24 muffins for a party. How much must David pay to get 24 muffins?",
      "answer0": "30",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 83,
      "difficulty_id": 3,
      "explanation": "Each $5 set gives 3 bought + 1 free = 4 muffins. To get 24 muffins he needs 24 ÷ 4 = 6 sets. Cost = 6 × $5 = $30.",
      "hints": ["Each $5 gives 4 muffins (3 + 1 free).", "Find how many groups of 4 make 24, then multiply by $5."],
      "source": "Ai Tong 2025 P3 Weighted Assessment 2 Q15(b)",
      "image_needed": true,
      "image_options": false,
      "image_file": "q15.png",
      "image_page": 10,
      "image_bbox": [0.18, 0.15, 0.82, 0.40],
      "image_loc": "'Sale! 3 for $5 / Buy 3 muffins and get 1 muffin free!' poster with muffin pictures, upper part of page",
      "notes": "Key Q15 b): 24 ÷ 4 = 6; 6 × 5 = $30. Answer in dollars. Same image as Q15(a)."
    }
  ]
}