Czechia · Grade 1 · Practice Sheet 21

1. 1.

   Fill in the missing number: 11 + ___ = 22.

   Formula:Missing Addend

   $b = \text{total} - a$

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2. 2.

   Add 13 and 45.

   Formula:Addition

   $\text{sum} = a + b$

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3. 3.

   What is 18 − 1?

   Formula:Subtraction

   $\text{difference} = a - b$

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4. 4.

   Add 59 and 51.

   Formula:Addition

   $\text{sum} = a + b$

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5. 5.

   What is 16 − 15?

   Formula:Subtraction

   $\text{difference} = a - b$

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6. 6.

   Continue the pattern by counting in 10s: 30, 40, ___

   Formula:Skip Counting

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

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7. 7.

   What is 5 + 3?

   Formula:Addition

   $\text{sum} = a + b$

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8. 8.

   Continue the pattern by counting in 2s: 4, 6, ___

   Formula:Skip Counting

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

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9. 9.

   What is 18 − 1?

   Formula:Subtraction

   $\text{difference} = a - b$

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10. 10.

    Continue the pattern by counting in 5s: 20, 25, ___

    Formula:Skip Counting

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

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11. 11.

    Fill in the missing number: 4 + ___ = 19.

    Formula:Missing Addend

    $b = \text{total} - a$

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12. 12.

    Add 29 and 46.

    Formula:Addition

    $\text{sum} = a + b$

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13. 13.

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

    Formula:Skip Counting

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

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14. 14.

    Add 26 and 37.

    Formula:Addition

    $\text{sum} = a + b$

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15. 15.

    What is double 15?

    Formula:Doubling

    $d = 2 \times n$

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16. 16.

    What is 6 + 4?

    Formula:Addition

    $\text{sum} = a + b$

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17. 17.

    Fill in the missing number: 6 + ___ = 20.

    Formula:Missing Addend

    $b = \text{total} - a$

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18. 18.

    What is double 13?

    Formula:Doubling

    $d = 2 \times n$

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19. 19.

    Add 30 and 22.

    Formula:Addition

    $\text{sum} = a + b$

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20. 20.

    What is double 6?

    Formula:Doubling

    $d = 2 \times n$

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