South Korea · Grade 1 · Practice Sheet 21

1. 1.

   What is 8 + 4?

   Formula:Addition

   $\text{sum} = a + b$

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2. 2.

   Add 28 and 30.

   Formula:Addition

   $\text{sum} = a + b$

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3. 3.

   Fill in the missing number: 14 + ___ = 26.

   Formula:Missing Addend

   $b = \text{total} - a$

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4. 4.

   What is double 17?

   Formula:Doubling

   $d = 2 \times n$

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5. 5.

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

   Formula:Skip Counting

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

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6. 6.

   What is double 22?

   Formula:Doubling

   $d = 2 \times n$

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7. 7.

   Fill in the missing number: 4 + ___ = 9.

   Formula:Missing Addend

   $b = \text{total} - a$

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8. 8.

   What is 8 + 3?

   Formula:Addition

   $\text{sum} = a + b$

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9. 9.

   What is double 8?

   Formula:Doubling

   $d = 2 \times n$

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10. 10.

    What is 12 − 9?

    Formula:Subtraction

    $\text{difference} = a - b$

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11. 11.

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

    Formula:Adding Money

    $\text{total} = a + b$

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12. 12.

    Fill in the missing number: 9 + ___ = 22.

    Formula:Missing Addend

    $b = \text{total} - a$

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13. 13.

    What is double 20?

    Formula:Doubling

    $d = 2 \times n$

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14. 14.

    Fill in the missing number: 2 + ___ = 8.

    Formula:Missing Addend

    $b = \text{total} - a$

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15. 15.

    What is double 19?

    Formula:Doubling

    $d = 2 \times n$

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16. 16.

    What is 15 − 13?

    Formula:Subtraction

    $\text{difference} = a - b$

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17. 17.

    What is double 8?

    Formula:Doubling

    $d = 2 \times n$

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18. 18.

    What is 6 + 7?

    Formula:Addition

    $\text{sum} = a + b$

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19. 19.

    What is 18 − 11?

    Formula:Subtraction

    $\text{difference} = a - b$

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20. 20.

    Continue the pattern by counting in 2s: 0, 2, ___

    Formula:Skip Counting

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

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