South Korea · Grade 3 · Practice Sheet 18

1. 1.

   Fill in the missing number: 9 + ___ = 19.

   Formula:Missing Addend

   $b = \text{total} - a$

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2. 2.

   Add 10 and 55.

   Formula:Addition

   $\text{sum} = a + b$

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3. 3.

   Subtract 73 from 87.

   Formula:Subtraction

   $\text{difference} = a - b$

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4. 4.

   Continue the pattern by counting in 10s: 20, 30, ___

   Formula:Skip Counting

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

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5. 5.

   21 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.

   Add 13 + 6 + 3.

   Formula:Addition of Three Numbers

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

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7. 7.

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

   Formula:Adding Money

   $\text{total} = a + b$

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8. 8.

   How many tens are there in the number 68?

   Formula:Place Value

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

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9. 9.

   What is double 5?

   Formula:Doubling

   $d = 2 \times n$

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10. 10.

    Fill in the missing number: 8 + ___ = 13.

    Formula:Missing Addend

    $b = \text{total} - a$

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11. 11.

    What is double 6?

    Formula:Doubling

    $d = 2 \times n$

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12. 12.

    What is half of 36?

    Formula:Halving

    $h = n \div 2$

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13. 13.

    Continue the pattern by counting in 2s: 2, 4, ___

    Formula:Skip Counting

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

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14. 14.

    Add 44 and 25.

    Formula:Addition

    $\text{sum} = a + b$

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15. 15.

    How many tens are there in the number 46?

    Formula:Place Value

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

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16. 16.

    What is half of 24?

    Formula:Halving

    $h = n \div 2$

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17. 17.

    How many tens are there in the number 57?

    Formula:Place Value

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

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18. 18.

    What is double 18?

    Formula:Doubling

    $d = 2 \times n$

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19. 19.

    What is 3 × 8?

    Formula:Multiplication (Times Tables)

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

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20. 20.

    How many tens are there in the number 91?

    Formula:Place Value

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

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