Market Day Number Challenge.

{
  "finish": "Excellent work. You read, rounded and calculated with whole numbers and decimal money amounts.",
  "steps": [
    {
      "question": "Kato sees 48,206 exercise books recorded for district schools. Which number is this?",
      "card": "forty-eight thousand, two hundred and six",
      "choices": ["48,206", "48,260", "4,826"],
      "answer": 0,
      "good": "Correct. Read the thousands first, then the hundreds, tens and ones.",
      "help": "The number has 48 thousands, 2 hundreds, 0 tens and 6 ones."
    },
    {
      "question": "Which words correctly write the number 63,415?",
      "card": "63,415",
      "choices": ["sixty-three thousand, four hundred and fifteen", "sixty-three hundred and fifteen", "six thousand, three hundred and forty-five"],
      "answer": 0,
      "good": "Yes. 63,415 is sixty-three thousand, four hundred and fifteen.",
      "help": "Start with 63 thousands, then read 415."
    },
    {
      "question": "In 57,428, what is the value of the digit 7?",
      "card": "57,428",
      "choices": ["7", "70", "7,000"],
      "answer": 2,
      "good": "Correct. The 7 is in the thousands place, so its value is 7,000.",
      "help": "Count from the right: ones, tens, hundreds, thousands."
    },
    {
      "question": "Kato rounds 46,782 to the nearest thousand. What is the rounded number?",
      "card": "46,782 ≈ ____",
      "choices": ["46,000", "47,000", "50,000"],
      "answer": 1,
      "good": "Brilliant. 46,782 rounds up to 47,000.",
      "help": "Look at the hundreds part: is it 500 or more?"
    },
    {
      "question": "One school buys 24,586 books and another buys 7,749 books. How many books do they buy altogether?",
      "card": "24,586 + 7,749 = ____",
      "choices": ["31,335", "32,335", "32,235"],
      "answer": 1,
      "good": "Correct. The total is 32,335 books.",
      "help": "Add ones, tens, hundreds and thousands carefully."
    },
    {
      "question": "There were 50,000 pencils in store. After 18,675 pencils were sent out, how many remained?",
      "card": "50,000 − 18,675 = ____",
      "choices": ["31,325", "32,325", "31,425"],
      "answer": 0,
      "good": "Yes. 31,325 pencils remained.",
      "help": "You may need to exchange across the zeros before subtracting."
    },
    {
      "question": "Four classes each receive 36 rulers. How many rulers are needed altogether?",
      "card": "36 × 4 = ____",
      "choices": ["124", "144", "164"],
      "answer": 1,
      "good": "Correct. Four groups of 36 make 144 rulers.",
      "help": "Multiply 30 × 4, then 6 × 4."
    },
    {
      "question": "156 reading cards are shared equally among 6 groups. How many cards does each group receive?",
      "card": "156 ÷ 6 = ____",
      "choices": ["24", "26", "36"],
      "answer": 1,
      "good": "Exactly. Each group receives 26 cards.",
      "help": "Ask: 6 × what number makes 156?"
    },
    {
      "question": "Kato buys a chart for 12.50 and markers for 7.25. What is the total cost?",
      "card": "12.50 + 7.25 = ____",
      "choices": ["19.75", "19.25", "20.75"],
      "answer": 0,
      "good": "Correct. 12.50 + 7.25 = 19.75.",
      "help": "Keep the decimal points lined up."
    },
    {
      "question": "Kato has 25.00 and spends 8.75 on chart paper. How much money remains?",
      "card": "25.00 − 8.75 = ____",
      "choices": ["16.25", "17.25", "16.75"],
      "answer": 0,
      "good": "Correct. 25.00 − 8.75 = 16.25.",
      "help": "Keep the decimal points lined up, then subtract carefully."
    },
    {
      "question": "A box holds 125 crayons. Six boxes are delivered to schools. How many crayons are delivered?",
      "card": "125 × 6 = ____",
      "choices": ["650", "750", "850"],
      "answer": 1,
      "good": "Excellent. Six groups of 125 make 750 crayons.",
      "help": "Multiply 100, 20 and 5 by 6. Add the parts."
    },
    {
      "question": "Independent check: Which number is seventy-two thousand and eighty-nine?",
      "card": "seventy-two thousand and eighty-nine",
      "choices": ["72,089", "72,809", "7,289"],
      "answer": 0,
      "good": "Correct. The number is 72,089.",
      "help": "Think about the thousands, hundreds, tens and ones."
    },
    {
      "question": "Independent check: Round 18,649 to the nearest hundred.",
      "card": "18,649 ≈ ____",
      "choices": ["18,600", "18,700", "19,000"],
      "answer": 0,
      "good": "Correct. 18,649 rounds down to 18,600.",
      "help": "For the nearest hundred, look at the tens digit."
    },
    {
      "question": "Independent check: A school had 13,875 exercise books and used 4,687. How many books remained?",
      "card": "13,875 − 4,687 = ____",
      "choices": ["9,188", "9,288", "8,188"],
      "answer": 0,
      "good": "Well done. 9,188 exercise books remained.",
      "help": "Exchange carefully when the top digit is smaller."
    },
    {
      "question": "Independent check: Four packets of pencils cost 2.75 each. What is the total cost?",
      "card": "4 × 2.75 = ____",
      "choices": ["10.00", "10.50", "11.00"],
      "answer": 2,
      "good": "Excellent. Four packets cost 11.00 altogether.",
      "help": "Add 2.75 four times if that helps."
    }
  ]
}