Cambodia · Grade 1 · Practice Sheet 21

1. 1.

   Fill in the missing number: 8 + ___ = 18.

   Formula:Missing Addend

   $b = \text{total} - a$

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2. 2.

   What is 7 − 5?

   Formula:Subtraction

   $\text{difference} = a - b$

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3. 3.

   Fill in the missing number: 14 + ___ = 29.

   Formula:Missing Addend

   $b = \text{total} - a$

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4. 4.

   What is 8 + 4?

   Formula:Addition

   $\text{sum} = a + b$

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5. 5.

   Add 27 and 35.

   Formula:Addition

   $\text{sum} = a + b$

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6. 6.

   What is double 22?

   Formula:Doubling

   $d = 2 \times n$

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7. 7.

   You have ៛ 1 and ៛ 2. How much money do you have altogether?

   Formula:Adding Money

   $\text{total} = a + b$

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8. 8.

   What is 9 + 3?

   Formula:Addition

   $\text{sum} = a + b$

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9. 9.

   What is double 2?

   Formula:Doubling

   $d = 2 \times n$

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10. 10.

    Fill in the missing number: 8 + ___ = 16.

    Formula:Missing Addend

    $b = \text{total} - a$

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11. 11.

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

    Formula:Adding Money

    $\text{total} = a + b$

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12. 12.

    Continue the pattern by counting in 10s: 40, 50, ___

    Formula:Skip Counting

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

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13. 13.

    Add 55 and 17.

    Formula:Addition

    $\text{sum} = a + b$

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14. 14.

    Fill in the missing number: 2 + ___ = 17.

    Formula:Missing Addend

    $b = \text{total} - a$

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15. 15.

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

    Formula:Adding Money

    $\text{total} = a + b$

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16. 16.

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

    Formula:Skip Counting

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

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17. 17.

    You have ៛ 5 and ៛ 2. How much money do you have altogether?

    Formula:Adding Money

    $\text{total} = a + b$

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18. 18.

    Fill in the missing number: 3 + ___ = 11.

    Formula:Missing Addend

    $b = \text{total} - a$

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19. 19.

    Add 33 and 30.

    Formula:Addition

    $\text{sum} = a + b$

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20. 20.

    What is 12 − 9?

    Formula:Subtraction

    $\text{difference} = a - b$

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