Hong Kong · Grade 1 · Practice Sheet 21

1. 1.

   You have HK$ 8 and HK$ 9. How much money do you have altogether?

   Formula:Adding Money

   $\text{total} = a + b$

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2. 2.

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

   Formula:Skip Counting

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

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3. 3.

   What is double 16?

   Formula:Doubling

   $d = 2 \times n$

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4. 4.

   Fill in the missing number: 7 + ___ = 14.

   Formula:Missing Addend

   $b = \text{total} - a$

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5. 5.

   What is 7 + 2?

   Formula:Addition

   $\text{sum} = a + b$

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6. 6.

   What is double 15?

   Formula:Doubling

   $d = 2 \times n$

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7. 7.

   Fill in the missing number: 10 + ___ = 25.

   Formula:Missing Addend

   $b = \text{total} - a$

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8. 8.

   What is 5 − 2?

   Formula:Subtraction

   $\text{difference} = a - b$

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9. 9.

   Fill in the missing number: 11 + ___ = 14.

   Formula:Missing Addend

   $b = \text{total} - a$

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10. 10.

    You have HK$ 6 and HK$ 5. How much money do you have altogether?

    Formula:Adding Money

    $\text{total} = a + b$

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11. 11.

    What is double 5?

    Formula:Doubling

    $d = 2 \times n$

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12. 12.

    Add 80 and 14.

    Formula:Addition

    $\text{sum} = a + b$

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13. 13.

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

    Formula:Skip Counting

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

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14. 14.

    Add 19 and 29.

    Formula:Addition

    $\text{sum} = a + b$

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15. 15.

    What is 18 − 3?

    Formula:Subtraction

    $\text{difference} = a - b$

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16. 16.

    Fill in the missing number: 10 + ___ = 14.

    Formula:Missing Addend

    $b = \text{total} - a$

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17. 17.

    Add 74 and 18.

    Formula:Addition

    $\text{sum} = a + b$

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18. 18.

    Fill in the missing number: 8 + ___ = 10.

    Formula:Missing Addend

    $b = \text{total} - a$

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19. 19.

    What is double 13?

    Formula:Doubling

    $d = 2 \times n$

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20. 20.

    Add 70 and 22.

    Formula:Addition

    $\text{sum} = a + b$

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