South Korea · Grade 1 · Practice Sheet 11

1. 1.

   Fill in the missing number: 12 + ___ = 14.

   Formula:Missing Addend

   $b = \text{total} - a$

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2. 2.

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

   Formula:Skip Counting

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

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3. 3.

   You have ₩8 and ₩4. How much money do you have altogether?

   Formula:Adding Money

   $\text{total} = a + b$

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4. 4.

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

   Formula:Skip Counting

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

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5. 5.

   What is double 8?

   Formula:Doubling

   $d = 2 \times n$

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6. 6.

   What is 5 + 4?

   Formula:Addition

   $\text{sum} = a + b$

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7. 7.

   Add 43 and 23.

   Formula:Addition

   $\text{sum} = a + b$

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8. 8.

   What is 13 − 4?

   Formula:Subtraction

   $\text{difference} = a - b$

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9. 9.

   Fill in the missing number: 8 + ___ = 12.

   Formula:Missing Addend

   $b = \text{total} - a$

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10. 10.

    What is double 19?

    Formula:Doubling

    $d = 2 \times n$

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11. 11.

    Add 74 and 26.

    Formula:Addition

    $\text{sum} = a + b$

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12. 12.

    You have ₩8 and ₩3. How much money do you have altogether?

    Formula:Adding Money

    $\text{total} = a + b$

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13. 13.

    Fill in the missing number: 7 + ___ = 21.

    Formula:Missing Addend

    $b = \text{total} - a$

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14. 14.

    What is 9 + 5?

    Formula:Addition

    $\text{sum} = a + b$

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15. 15.

    Add 55 and 37.

    Formula:Addition

    $\text{sum} = a + b$

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16. 16.

    Fill in the missing number: 8 + ___ = 11.

    Formula:Missing Addend

    $b = \text{total} - a$

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17. 17.

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

    Formula:Skip Counting

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

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18. 18.

    Add 70 and 28.

    Formula:Addition

    $\text{sum} = a + b$

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19. 19.

    Continue the pattern by counting in 2s: 8, 10, ___

    Formula:Skip Counting

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

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20. 20.

    What is 16 − 10?

    Formula:Subtraction

    $\text{difference} = a - b$

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