South Korea · Grade 3 · Practice Sheet 7

1. 1.

   What is double 8?

   Formula:Doubling

   $d = 2 \times n$

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2. 2.

   Fill in the missing number: 15 + ___ = 27.

   Formula:Missing Addend

   $b = \text{total} - a$

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3. 3.

   You have ₩2 and ₩3. How much money do you have altogether?

   Formula:Adding Money

   $\text{total} = a + b$

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4. 4.

   Add 17 and 37.

   Formula:Addition

   $\text{sum} = a + b$

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5. 5.

   18 sweets are shared equally among 3 children. How many does each child get?

   Formula:Division (Equal Sharing)

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

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6. 6.

   There are 2 bags with 4 apples in each bag. How many apples are there in total?

   Formula:Multiplication as Repeated Addition

   $\text{total} = \text{groups} \times \text{size}$

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7. 7.

   What is half of 8?

   Formula:Halving

   $h = n \div 2$

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8. 8.

   Add 79 and 36.

   Formula:Addition

   $\text{sum} = a + b$

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9. 9.

   Subtract 21 from 32.

   Formula:Subtraction

   $\text{difference} = a - b$

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10. 10.

    Add 18 and 40.

    Formula:Addition

    $\text{sum} = a + b$

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11. 11.

    Continue the pattern by counting in 5s: 20, 25, ___

    Formula:Skip Counting

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

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12. 12.

    You have ₩4 and ₩1. How much money do you have altogether?

    Formula:Adding Money

    $\text{total} = a + b$

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13. 13.

    54 sweets are shared equally among 6 children. How many does each child get?

    Formula:Division (Equal Sharing)

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

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14. 14.

    Subtract 8 from 40.

    Formula:Subtraction

    $\text{difference} = a - b$

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15. 15.

    How many tens are there in the number 39?

    Formula:Place Value

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

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16. 16.

    Subtract 23 from 32.

    Formula:Subtraction

    $\text{difference} = a - b$

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17. 17.

    Add 8 + 7 + 8.

    Formula:Addition of Three Numbers

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

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18. 18.

    Continue the pattern by counting in 5s: 0, 5, ___

    Formula:Skip Counting

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

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19. 19.

    You have ₩9 and ₩6. How much money do you have altogether?

    Formula:Adding Money

    $\text{total} = a + b$

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20. 20.

    Add 17 and 41.

    Formula:Addition

    $\text{sum} = a + b$

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