Vietnam · Grade 1 · Practice Sheet 20

1. 1.

   What is double 15?

   Formula:Doubling

   $d = 2 \times n$

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2. 2.

   Fill in the missing number: 14 + ___ = 20.

   Formula:Missing Addend

   $b = \text{total} - a$

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3. 3.

   What is double 15?

   Formula:Doubling

   $d = 2 \times n$

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4. 4.

   Add 82 and 19.

   Formula:Addition

   $\text{sum} = a + b$

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5. 5.

   What is 5 + 7?

   Formula:Addition

   $\text{sum} = a + b$

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6. 6.

   What is double 11?

   Formula:Doubling

   $d = 2 \times n$

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7. 7.

   What is 15 − 5?

   Formula:Subtraction

   $\text{difference} = a - b$

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8. 8.

   You have VND 6 and VND 9. How much money do you have altogether?

   Formula:Adding Money

   $\text{total} = a + b$

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9. 9.

   What is 11 − 3?

   Formula:Subtraction

   $\text{difference} = a - b$

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10. 10.

    What is 2 + 2?

    Formula:Addition

    $\text{sum} = a + b$

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11. 11.

    Add 43 and 32.

    Formula:Addition

    $\text{sum} = a + b$

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12. 12.

    What is double 9?

    Formula:Doubling

    $d = 2 \times n$

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13. 13.

    Add 30 and 17.

    Formula:Addition

    $\text{sum} = a + b$

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14. 14.

    What is 6 − 4?

    Formula:Subtraction

    $\text{difference} = a - b$

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15. 15.

    What is double 17?

    Formula:Doubling

    $d = 2 \times n$

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16. 16.

    What is 10 − 5?

    Formula:Subtraction

    $\text{difference} = a - b$

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17. 17.

    You have VND 1 and VND 3. How much money do you have altogether?

    Formula:Adding Money

    $\text{total} = a + b$

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18. 18.

    What is 14 − 8?

    Formula:Subtraction

    $\text{difference} = a - b$

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19. 19.

    Fill in the missing number: 3 + ___ = 8.

    Formula:Missing Addend

    $b = \text{total} - a$

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20. 20.

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

    Formula:Skip Counting

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

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