South Korea · Grade 1 · Practice Sheet 31

1. 1.

   Fill in the missing number: 7 + ___ = 13.

   Formula:Missing Addend

   $b = \text{total} - a$

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2. 2.

   Add 21 and 20.

   Formula:Addition

   $\text{sum} = a + b$

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3. 3.

   What is double 13?

   Formula:Doubling

   $d = 2 \times n$

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4. 4.

   Fill in the missing number: 6 + ___ = 12.

   Formula:Missing Addend

   $b = \text{total} - a$

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5. 5.

   What is double 17?

   Formula:Doubling

   $d = 2 \times n$

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6. 6.

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

   Formula:Adding Money

   $\text{total} = a + b$

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7. 7.

   Add 63 and 38.

   Formula:Addition

   $\text{sum} = a + b$

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8. 8.

   What is 2 + 3?

   Formula:Addition

   $\text{sum} = a + b$

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9. 9.

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

   Formula:Skip Counting

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

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10. 10.

    You have ₩5 and ₩7. How much money do you have altogether?

    Formula:Adding Money

    $\text{total} = a + b$

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11. 11.

    Add 20 and 44.

    Formula:Addition

    $\text{sum} = a + b$

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12. 12.

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

    Formula:Skip Counting

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

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13. 13.

    You have ₩7 and ₩3. How much money do you have altogether?

    Formula:Adding Money

    $\text{total} = a + b$

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14. 14.

    Add 53 and 14.

    Formula:Addition

    $\text{sum} = a + b$

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15. 15.

    You have ₩6 and ₩2. How much money do you have altogether?

    Formula:Adding Money

    $\text{total} = a + b$

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16. 16.

    Add 46 and 51.

    Formula:Addition

    $\text{sum} = a + b$

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17. 17.

    What is 5 + 2?

    Formula:Addition

    $\text{sum} = a + b$

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18. 18.

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

    Formula:Skip Counting

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

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19. 19.

    What is 5 + 9?

    Formula:Addition

    $\text{sum} = a + b$

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20. 20.

    What is double 19?

    Formula:Doubling

    $d = 2 \times n$

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