South Korea · Grade 3 · Practice Sheet 9

1. 1.

   You have ₩7 and ₩4. How much money do you have altogether?

   Formula:Adding Money

   $\text{total} = a + b$

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2. 2.

   Continue the pattern by counting in 10s: 10, 20, ___

   Formula:Skip Counting

   $\text{next} = \text{term} + \text{step}$

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3. 3.

   Fill in the missing number: 13 + ___ = 22.

   Formula:Missing Addend

   $b = \text{total} - a$

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4. 4.

   Add 15 + 7 + 14.

   Formula:Addition of Three Numbers

   $\text{sum} = a + b + c$

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5. 5.

   You have ₩7 and ₩8. How much money do you have altogether?

   Formula:Adding Money

   $\text{total} = a + b$

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6. 6.

   Fill in the missing number: 13 + ___ = 18.

   Formula:Missing Addend

   $b = \text{total} - a$

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7. 7.

   What is double 13?

   Formula:Doubling

   $d = 2 \times n$

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8. 8.

   Add 14 + 13 + 3.

   Formula:Addition of Three Numbers

   $\text{sum} = a + b + c$

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9. 9.

   What is double 10?

   Formula:Doubling

   $d = 2 \times n$

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10. 10.

    How many tens are there in the number 31?

    Formula:Place Value

    $\text{value} = \text{tens} \times 10 + \text{ones}$

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11. 11.

    Add 5 + 20 + 18.

    Formula:Addition of Three Numbers

    $\text{sum} = a + b + c$

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12. 12.

    What is double 19?

    Formula:Doubling

    $d = 2 \times n$

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13. 13.

    35 sweets are shared equally among 5 children. How many does each child get?

    Formula:Division (Equal Sharing)

    $\text{each} = \text{total} \div \text{groups}$

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14. 14.

    What is half of 40?

    Formula:Halving

    $h = n \div 2$

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15. 15.

    Add 4 + 17 + 4.

    Formula:Addition of Three Numbers

    $\text{sum} = a + b + c$

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16. 16.

    What is 2 × 3?

    Formula:Multiplication (Times Tables)

    $\text{product} = a \times b$

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17. 17.

    Fill in the missing number: 6 + ___ = 19.

    Formula:Missing Addend

    $b = \text{total} - a$

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18. 18.

    What is double 23?

    Formula:Doubling

    $d = 2 \times n$

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19. 19.

    How many tens are there in the number 62?

    Formula:Place Value

    $\text{value} = \text{tens} \times 10 + \text{ones}$

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20. 20.

    Add 10 + 12 + 18.

    Formula:Addition of Three Numbers

    $\text{sum} = a + b + c$

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