{
  "paper": {
    "school": "Nan Hua",
    "year": 2025,
    "level": "P4",
    "label": "Weighted Assessment 1",
    "source_prefix": "Nan Hua 2025 P4 Weighted Assessment 1",
    "has_answer_key": true
  },
  "questions": [
    {
      "n": 1,
      "type_id": 1,
      "question": "Which of the following is forty-five thousand, nine hundred and six in numerals?",
      "answer0": "40 906",
      "answer1": "40 960",
      "answer2": "45 906",
      "answer3": "45 960",
      "correct_answer": 2,
      "skill_id": 105,
      "difficulty_id": 1,
      "explanation": "Forty-five thousand = 45 000, nine hundred = 900, and six = 6. Adding these gives 45 000 + 900 + 6 = 45 906. The answer is option (3), 45 906.",
      "hints": ["Break the words into ten-thousands, thousands, hundreds, tens and ones.", "Forty-five thousand is 45 000; nine hundred and six is 906."],
      "source": "Nan Hua 2025 P4 Weighted Assessment 1 Q1",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: option 3."
    },
    {
      "n": 2,
      "type_id": 1,
      "question": "Arrange these numbers in decreasing order.<br>86 372, 85 327, 86 237",
      "answer0": "86 237, 86 372, 85 327",
      "answer1": "86 372, 86 237, 85 327",
      "answer2": "85 327, 86 237, 86 372",
      "answer3": "85 327, 86 372, 86 237",
      "correct_answer": 1,
      "skill_id": 107,
      "difficulty_id": 1,
      "explanation": "Decreasing order means largest to smallest. Compare the thousands: 86 372 and 86 237 both have 86 thousands, and 85 327 has 85 thousands so it is smallest. Between 86 372 and 86 237, the hundreds 3 > 2, so 86 372 > 86 237. Order: 86 372, 86 237, 85 327. The answer is option (2).",
      "hints": ["Decreasing order = largest first.", "Compare digit by digit from the left, starting with the ten thousands."],
      "source": "Nan Hua 2025 P4 Weighted Assessment 1 Q2",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: option 2."
    },
    {
      "n": 3,
      "type_id": 1,
      "question": "In the following number pattern, what is the missing number?<br>62 831, 62 931, ____________, 63 131, 63 231, 63 331, 63 431",
      "answer0": "62 131",
      "answer1": "62 031",
      "answer2": "63 031",
      "answer3": "63 931",
      "correct_answer": 2,
      "skill_id": 108,
      "difficulty_id": 2,
      "explanation": "Each term increases by 100: 62 831 + 100 = 62 931, then 62 931 + 100 = 63 031. Checking forward, 63 031 + 100 = 63 131 which matches. The missing number is 63 031, option (3).",
      "hints": ["Find the step by subtracting one term from the next.", "62 931 - 62 831 = 100, so add 100 each time."],
      "source": "Nan Hua 2025 P4 Weighted Assessment 1 Q3",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: option 3."
    },
    {
      "n": 4,
      "type_id": 1,
      "question": "Which of the following numbers when rounded to the nearest hundred becomes 84 000?",
      "answer0": "83 875",
      "answer1": "83 953",
      "answer2": "84 092",
      "answer3": "84 234",
      "correct_answer": 1,
      "skill_id": 109,
      "difficulty_id": 2,
      "explanation": "Rounding to the nearest hundred: 83 875 rounds to 83 900; 83 953 rounds to 84 000; 84 092 rounds to 84 100; 84 234 rounds to 84 200. Only 83 953 rounds to 84 000. The answer is option (2).",
      "hints": ["Look at the tens digit to decide whether to round the hundreds up or down.", "A number rounds to 84 000 if it lies between 83 950 and 84 049."],
      "source": "Nan Hua 2025 P4 Weighted Assessment 1 Q4",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: option 2."
    },
    {
      "n": 5,
      "type_id": 1,
      "question": "Which of the following has both 4 and 7 as factors?",
      "answer0": "11",
      "answer1": "21",
      "answer2": "64",
      "answer3": "84",
      "correct_answer": 3,
      "skill_id": 111,
      "difficulty_id": 2,
      "explanation": "A number with both 4 and 7 as factors must be a multiple of $$4 \\times 7 = 28$$. Checking: 11 (no), 21 = 3 x 7 (only 7), 64 = 4 x 16 (only 4), 84 = 28 x 3 (both 4 and 7). The answer is option (4), 84.",
      "hints": ["A number divisible by both 4 and 7 must be divisible by their product, 28.", "Test which option is a multiple of 28."],
      "source": "Nan Hua 2025 P4 Weighted Assessment 1 Q5",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: option 4."
    },
    {
      "n": 6,
      "type_id": 1,
      "question": "At a party, every 6th guest gets a lollipop and every 8th guest gets a packet of juice. Which guest is the first to get both a lollipop and a packet of juice?",
      "answer0": "16th",
      "answer1": "18th",
      "answer2": "24th",
      "answer3": "48th",
      "correct_answer": 2,
      "skill_id": 115,
      "difficulty_id": 2,
      "explanation": "The first guest to get both is the lowest common multiple of 6 and 8. Multiples of 6: 6, 12, 18, 24; multiples of 8: 8, 16, 24. The smallest common multiple is 24, so the 24th guest is first to get both. The answer is option (3).",
      "hints": ["Find the lowest common multiple (LCM) of 6 and 8.", "List multiples of each and find the first one that appears in both lists."],
      "source": "Nan Hua 2025 P4 Weighted Assessment 1 Q6",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: option 3."
    },
    {
      "n": 7,
      "type_id": 2,
      "question": "a) What is the value of the digit 7 in 58 701?<br>b) Round 19 572 to the nearest thousand.",
      "answer0": "700",
      "answer1": "20000",
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 105,
      "difficulty_id": 1,
      "explanation": "a) In 58 701 the digit 7 is in the hundreds place, so its value is $$7 \\times 100 = 700$$. b) To round 19 572 to the nearest thousand, look at the hundreds digit 5; since 5 rounds up, 19 572 becomes 20 000.",
      "hints": ["a) Identify the place of the digit 7, then multiply by its place value.", "b) Look at the hundreds digit to decide rounding up or down."],
      "source": "Nan Hua 2025 P4 Weighted Assessment 1 Q7",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Two blanks: a) 700, b) 20 000. Answers stored without space (20000)."
    },
    {
      "n": 8,
      "type_id": 2,
      "question": "a) Write 7 ten thousands, 64 tens and 3 ones in numerals.<br>b) Find the value of $$4308 \\times 9$$.",
      "answer0": "70643",
      "answer1": "38772",
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 116,
      "difficulty_id": 2,
      "explanation": "a) 7 ten thousands = 70 000, 64 tens = 640, 3 ones = 3. Sum: 70 000 + 640 + 3 = 70 643. b) $$4308 \\times 9 = 38772$$.",
      "hints": ["a) Convert each group to its value: 7 ten thousands is 70 000 and 64 tens is 640.", "b) Multiply 4308 by 9 using column multiplication."],
      "source": "Nan Hua 2025 P4 Weighted Assessment 1 Q8",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Two blanks: a) 70 643, b) 38 772. Stored without spaces."
    },
    {
      "n": 9,
      "type_id": 1,
      "question": "Read the statements made by these 2 students carefully. Ariel says 4 is a factor of 96. Tom says 4 is a factor of 76. One of the following statements is correct.",
      "answer0": "Ariel is correct and Tom is wrong.",
      "answer1": "Ariel is wrong and Tom is correct.",
      "answer2": "Both Ariel and Tom are correct.",
      "answer3": "Both Ariel and Tom are wrong.",
      "correct_answer": 2,
      "skill_id": 112,
      "difficulty_id": 2,
      "explanation": "Check whether 4 divides each number. 96 divided by 4 is 24 with no remainder, so 4 is a factor of 96 (Ariel is correct). 76 divided by 4 is 19 with no remainder, so 4 is a factor of 76 (Tom is correct). Both are correct, so the correct statement is 'Both Ariel and Tom are correct.'",
      "hints": ["A number is a factor of another if it divides it with no remainder.", "Divide 96 by 4 and 76 by 4 and check the remainders."],
      "source": "Nan Hua 2025 P4 Weighted Assessment 1 Q9",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Original is a tick-the-correct-statement table with a decorative speech-bubble figure; converted to MCQ using the four statements as options. Key: statement 3 (Both correct), 0-based index 2. Decorative cartoon not needed for the math."
    },
    {
      "n": 10,
      "type_id": 2,
      "question": "Alvin, Simon and Tina shared $6726 equally among themselves. Simon spent $1045 of his money. How much money did Simon have in the end?",
      "answer0": "1197",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 118,
      "difficulty_id": 2,
      "explanation": "Each person's share: $$6726 \\div 3 = 2242$$, so Simon had $2242. After spending $1045: $$2242 - 1045 = 1197$$. Simon had $1197 left.",
      "hints": ["First divide the total equally among the 3 people.", "Then subtract what Simon spent from his share."],
      "source": "Nan Hua 2025 P4 Weighted Assessment 1 Q10",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Answer $1197 (money, plain). Stored as 1197."
    },
    {
      "n": 11,
      "type_id": 2,
      "question": "Mike has 75 packets of stamps. Each packet has 26 stamps. He packs all his stamps into bags of 5. How many bags of 5 stamps are there?",
      "answer0": "390",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 118,
      "difficulty_id": 2,
      "explanation": "Total stamps: $$75 \\times 26 = 1950$$. Each bag holds 5 stamps, so number of bags: $$1950 \\div 5 = 390$$. There are 390 bags.",
      "hints": ["First find the total number of stamps Mike has.", "Then divide the total by 5 to find the number of bags."],
      "source": "Nan Hua 2025 P4 Weighted Assessment 1 Q11",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Answer 390 bags."
    },
    {
      "n": 12,
      "type_id": 2,
      "question": "A desk cost twice as much as a chair. Daniel spent $2264 on 2 identical desks and 4 identical chairs. What was the total cost of a desk and a chair?",
      "answer0": "849",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 118,
      "difficulty_id": 3,
      "explanation": "Let a chair be 1 unit; a desk is then 2 units. 2 desks = 4 units and 4 chairs = 4 units, giving $$4 + 4 = 8$$ units. So 8 units = $2264 and 1 unit = $$2264 \\div 8 = 283$$. A desk and a chair together = 2 units + 1 unit = 3 units = $$283 \\times 3 = 849$$. The total cost is $849.",
      "hints": ["Let the chair be 1 unit and the desk 2 units, then count total units in $2264.", "Find the value of 1 unit, then add 1 desk (2 units) and 1 chair (1 unit) = 3 units."],
      "source": "Nan Hua 2025 P4 Weighted Assessment 1 Q12",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Answer $849."
    },
    {
      "n": 13,
      "type_id": 2,
      "question": "Sandy had some sweets to give her friends. If she gave each friend 4 sweets, she would have 22 sweets left. If she gave each friend 6 sweets, she would have 8 sweets left. How many sweets did Sandy have?",
      "answer0": "50",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 118,
      "difficulty_id": 3,
      "explanation": "Each friend gets 2 more sweets in the second case ($$6 - 4 = 2$$), and the leftover drops by $$22 - 8 = 14$$ sweets. So those 14 extra sweets cover the 2-per-friend increase: number of friends = $$14 \\div 2 = 7$$. Total sweets = (4 sweets x 7 friends) + 22 left over = $$28 + 22 = 50$$. Sandy had 50 sweets.",
      "hints": ["Find how many more sweets are given out per friend and how the leftover changes.", "Divide the change in leftovers by the extra per friend to find the number of friends, then work back to the total."],
      "source": "Nan Hua 2025 P4 Weighted Assessment 1 Q13",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Answer 50 sweets."
    }
  ]
}