South Korea · Grade 3 · Practice Sheet 17

1. 1.

   Subtract 5 from 79.

   Formula:Subtraction

   $\text{difference} = a - b$

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2. 2.

   Fill in the missing number: 4 + ___ = 8.

   Formula:Missing Addend

   $b = \text{total} - a$

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3. 3.

   Continue the pattern by counting in 3s: 6, 9, ___

   Formula:Skip Counting

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

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4. 4.

   You have ₩5 and ₩1. How much money do you have altogether?

   Formula:Adding Money

   $\text{total} = a + b$

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5. 5.

   How many tens are there in the number 49?

   Formula:Place Value

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

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6. 6.

   Fill in the missing number: 10 + ___ = 14.

   Formula:Missing Addend

   $b = \text{total} - a$

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7. 7.

   What is half of 40?

   Formula:Halving

   $h = n \div 2$

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8. 8.

   There are 5 bags with 2 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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9. 9.

   What is 10 × 3?

   Formula:Multiplication (Times Tables)

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

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10. 10.

    There are 5 bags with 3 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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11. 11.

    Continue the pattern by counting in 3s: 12, 15, ___

    Formula:Skip Counting

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

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12. 12.

    What is half of 14?

    Formula:Halving

    $h = n \div 2$

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13. 13.

    Fill in the missing number: 10 + ___ = 19.

    Formula:Missing Addend

    $b = \text{total} - a$

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14. 14.

    What is double 5?

    Formula:Doubling

    $d = 2 \times n$

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15. 15.

    What is half of 12?

    Formula:Halving

    $h = n \div 2$

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16. 16.

    There are 4 bags with 7 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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17. 17.

    12 sweets are shared equally among 2 children. How many does each child get?

    Formula:Division (Equal Sharing)

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

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18. 18.

    What is 3 × 9?

    Formula:Multiplication (Times Tables)

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

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19. 19.

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

    Formula:Adding Money

    $\text{total} = a + b$

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20. 20.

    Fill in the missing number: 14 + ___ = 24.

    Formula:Missing Addend

    $b = \text{total} - a$

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