Taiwan · Grade 2 · Practice Sheet 21

1. 1.

   How many tens are there in the number 53?

   Formula:Place Value

   $\text{value} = \text{tens} \times 10 + \text{ones}$

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2. 2.

   What is 17 − 11?

   Formula:Subtraction

   $\text{difference} = a - b$

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3. 3.

   Fill in the missing number: 5 + ___ = 8.

   Formula:Missing Addend

   $b = \text{total} - a$

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4. 4.

   What is double 3?

   Formula:Doubling

   $d = 2 \times n$

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5. 5.

   What is 9 + 3?

   Formula:Addition

   $\text{sum} = a + b$

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6. 6.

   You have NT$ 6 and NT$ 8. How much money do you have altogether?

   Formula:Adding Money

   $\text{total} = a + b$

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7. 7.

   What is double 18?

   Formula:Doubling

   $d = 2 \times n$

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8. 8.

   What is half of 32?

   Formula:Halving

   $h = n \div 2$

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9. 9.

   Fill in the missing number: 10 + ___ = 23.

   Formula:Missing Addend

   $b = \text{total} - a$

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10. 10.

    What is 9 + 7?

    Formula:Addition

    $\text{sum} = a + b$

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11. 11.

    Add 19 + 10 + 2.

    Formula:Addition of Three Numbers

    $\text{sum} = a + b + c$

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12. 12.

    What is 6 − 2?

    Formula:Subtraction

    $\text{difference} = a - b$

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13. 13.

    Continue the pattern by counting in 5s: 15, 20, ___

    Formula:Skip Counting

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

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14. 14.

    How many tens are there in the number 88?

    Formula:Place Value

    $\text{value} = \text{tens} \times 10 + \text{ones}$

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15. 15.

    What is 12 − 11?

    Formula:Subtraction

    $\text{difference} = a - b$

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16. 16.

    Subtract 19 from 42.

    Formula:Subtraction

    $\text{difference} = a - b$

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17. 17.

    What is half of 22?

    Formula:Halving

    $h = n \div 2$

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18. 18.

    There are 3 bags with 8 apples in each bag. How many apples are there in total?

    Formula:Multiplication as Repeated Addition

    $\text{total} = \text{groups} \times \text{size}$

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19. 19.

    You have NT$ 8 and NT$ 2. How much money do you have altogether?

    Formula:Adding Money

    $\text{total} = a + b$

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20. 20.

    What is half of 6?

    Formula:Halving

    $h = n \div 2$

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