{
  "paper": {
    "school": "Nan Hua",
    "year": 2022,
    "level": "P3",
    "label": "Weighted Assessment 1",
    "source_prefix": "Nan Hua 2022 P3 Weighted Assessment 1",
    "has_answer_key": true
  },
  "questions": [
    {
      "n": 1,
      "type_id": 1,
      "question": "Which of the following is six thousand, four hundred and eight in numerals?",
      "answer0": "6048",
      "answer1": "6400",
      "answer2": "6408",
      "answer3": "6480",
      "correct_answer": 2,
      "skill_id": 67,
      "difficulty_id": 1,
      "explanation": "Six thousand, four hundred and eight = 6000 + 400 + 8 = 6408.",
      "hints": ["Six thousand is 6000.", "Four hundred and eight is 408; there are no tens."],
      "source": "Nan Hua 2022 P3 Weighted Assessment 1 Q1",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: option 3 (0-based 2)."
    },
    {
      "n": 2,
      "type_id": 1,
      "question": "What is the value of digit 3 in 4379?",
      "answer0": "30",
      "answer1": "300",
      "answer2": "3",
      "answer3": "3000",
      "correct_answer": 1,
      "skill_id": 66,
      "difficulty_id": 1,
      "explanation": "In 4379 the digit 3 is in the hundreds place, so its value is 300.",
      "hints": ["Identify which place the digit 3 sits in.", "3 is in the hundreds column of 4379."],
      "source": "Nan Hua 2022 P3 Weighted Assessment 1 Q2",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: option 2 (0-based 1)."
    },
    {
      "n": 3,
      "type_id": 1,
      "question": "What is the number shown?",
      "answer0": "2065",
      "answer1": "2506",
      "answer2": "2605",
      "answer3": "2650",
      "correct_answer": 2,
      "skill_id": 66,
      "difficulty_id": 2,
      "explanation": "2 thousands + 6 hundreds + 5 ones = 2000 + 600 + 5 = 2605.",
      "hints": ["There are 2 thousands, 6 hundreds and 5 ones.", "There are 0 tens, so a 0 sits in the tens place."],
      "source": "Nan Hua 2022 P3 Weighted Assessment 1 Q3",
      "image_needed": true,
      "image_options": false,
      "image_file": "q3.png",
      "notes": "Figure on page 2: boxes labelled '6 hundreds', '2 thousands', '5 ones' feeding into a '?' box. Key: option 3 (0-based 2)."
    },
    {
      "n": 4,
      "type_id": 1,
      "question": "Which of the following numbers is the smallest?",
      "answer0": "8902",
      "answer1": "8931",
      "answer2": "8796",
      "answer3": "8769",
      "correct_answer": 3,
      "skill_id": 68,
      "difficulty_id": 1,
      "explanation": "All start with 8. Compare hundreds: 8769 and 8796 have 7 hundreds (smaller than 9). Then compare tens: 8769 has 6 tens, smaller than 8796's 9 tens, so 8769 is smallest.",
      "hints": ["Compare the thousands, then the hundreds digit.", "Two numbers have 7 hundreds; compare their tens digits."],
      "source": "Nan Hua 2022 P3 Weighted Assessment 1 Q4",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: option 4 (0-based 3)."
    },
    {
      "n": 5,
      "type_id": 2,
      "question": "Arrange the following numbers from the smallest to the greatest. 3210, 2501, 3127 [?], [?], [?]",
      "answer0": "2501",
      "answer1": "3127",
      "answer2": "3210",
      "answer3": null,
      "correct_answer": null,
      "skill_id": 69,
      "difficulty_id": 2,
      "explanation": "2501 has 2 thousands (smallest). 3127 and 3210 both have 3 thousands; compare hundreds: 1 < 2, so 3127 < 3210. Order: 2501, 3127, 3210.",
      "hints": ["Compare the thousands digit first.", "For the two numbers starting with 3, compare the hundreds digit."],
      "source": "Nan Hua 2022 P3 Weighted Assessment 1 Q5",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Original MCQ converted to FIB ordering (smallest to greatest). Key option 2 confirms order 2501, 3127, 3210."
    },
    {
      "n": 6,
      "type_id": 2,
      "question": "In the number pattern below, what is the missing number? 5088, 5091, 5094, 5097, [?], 5103",
      "answer0": "5100",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 69,
      "difficulty_id": 1,
      "explanation": "The pattern increases by 3 each time: 5097 + 3 = 5100.",
      "hints": ["Find the difference between consecutive numbers.", "Each number is 3 more than the previous one."],
      "source": "Nan Hua 2022 P3 Weighted Assessment 1 Q6",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Original MCQ converted to FIB (single definite value). Key: option 3 = 5100."
    },
    {
      "n": 7,
      "type_id": 2,
      "question": "Find the value of 3826 + 2641.",
      "answer0": "6467",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 70,
      "difficulty_id": 1,
      "explanation": "3826 + 2641 = 6467.",
      "hints": ["Add the ones, then tens, hundreds and thousands.", "6 + 1 = 7 ones; carry where needed."],
      "source": "Nan Hua 2022 P3 Weighted Assessment 1 Q7",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Original MCQ converted to FIB (definite computation value). Key: option 4 = 6467."
    },
    {
      "n": 8,
      "type_id": 2,
      "question": "The sum of two numbers is 4567. One of the numbers is 2468. [?]",
      "answer0": "2099",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 71,
      "difficulty_id": 2,
      "explanation": "The other number = 4567 - 2468 = 2099.",
      "hints": ["To find the other addend, subtract from the sum.", "4567 - 2468 = 2099."],
      "source": "Nan Hua 2022 P3 Weighted Assessment 1 Q8",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Original MCQ converted to FIB (definite value); stem keeps 'What is the other number?' as the [?] blank. Key: option 1 = 2099."
    },
    {
      "n": 9,
      "type_id": 2,
      "question": "(a) Use the digits 2, 5, 7 to form the greatest 3-digit odd number. [?] (b) Use the digits 0, 2, 5 to form the smallest 3-digit even number. [?]",
      "answer0": "725",
      "answer1": "250",
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 68,
      "difficulty_id": 2,
      "explanation": "(a) Greatest odd: must end in odd digit. Largest with digits 2,5,7 ending odd is 725. (b) Smallest even: must end in even digit and not start with 0; smallest is 250.",
      "hints": ["An odd number ends in an odd digit; put the largest digits in front.", "An even number ends in an even digit; the leading digit cannot be 0."],
      "source": "Nan Hua 2022 P3 Weighted Assessment 1 Q9",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Two-part FIB. Digit tiles shown on page 4 are just the digit sets (transcribed into the stem). Key: (a) 725, (b) 250."
    },
    {
      "n": 10,
      "type_id": 2,
      "question": "1503 people were at a book fair. 942 were children and the rest were adults. How many adults were at the book fair? [?]",
      "answer0": "561",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 71,
      "difficulty_id": 1,
      "explanation": "Adults = 1503 - 942 = 561.",
      "hints": ["Subtract the number of children from the total.", "1503 - 942 = 561."],
      "source": "Nan Hua 2022 P3 Weighted Assessment 1 Q10",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: 1503 - 942 = 561."
    },
    {
      "n": 11,
      "type_id": 2,
      "question": "There are 820 red markers and 1048 blue markers in a shop. How many markers are there altogether? [?]",
      "answer0": "1868",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 71,
      "difficulty_id": 1,
      "explanation": "Total markers = 820 + 1048 = 1868.",
      "hints": ["'Altogether' means add the two amounts.", "820 + 1048 = 1868."],
      "source": "Nan Hua 2022 P3 Weighted Assessment 1 Q11",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: 820 + 1048 = 1868."
    },
    {
      "n": 12,
      "type_id": 2,
      "question": "Jack had 2000 marbles. He had 653 more marbles than Tom. (a) How many marbles did Tom have? (b) Tom bought another 480 marbles. How many marbles did Tom have in total? [?], [?]",
      "answer0": "1347",
      "answer1": "1827",
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 71,
      "difficulty_id": 2,
      "explanation": "(a) Tom = 2000 - 653 = 1347 marbles. (b) After buying 480 more: 1347 + 480 = 1827 marbles.",
      "hints": ["Jack has 653 MORE, so Tom has fewer: subtract 653 from 2000.", "Add the 480 new marbles to Tom's amount from part (a)."],
      "source": "Nan Hua 2022 P3 Weighted Assessment 1 Q12",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Two-part FIB. Key: (a) 2000 - 653 = 1347; (b) 1347 + 480 = 1827."
    },
    {
      "n": 13,
      "type_id": 2,
      "question": "Mary saved $799 in February. She saved $253 less in February than in January. How much did Mary save altogether in January and in February? [?]",
      "answer0": "1851",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 71,
      "difficulty_id": 3,
      "explanation": "January saving = 799 + 253 = $1052 (Feb was $253 less). Altogether = 1052 + 799 = $1851.",
      "hints": ["February is $253 LESS than January, so January = 799 + 253.", "Add January and February savings together."],
      "source": "Nan Hua 2022 P3 Weighted Assessment 1 Q13",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Answer is a money amount ($1851). Key: 799 + 253 = 1052; 1052 + 799 = 1851."
    }
  ]
}