South Korea · Grade 2 · Practice Sheet 28

1. 1.

   Fill in the missing number: 8 + ___ = 20.

   Formula:Missing Addend

   $b = \text{total} - a$

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2. 2.

   What is double 6?

   Formula:Doubling

   $d = 2 \times n$

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3. 3.

   What is half of 14?

   Formula:Halving

   $h = n \div 2$

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4. 4.

   What is double 12?

   Formula:Doubling

   $d = 2 \times n$

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5. 5.

   How many tens are there in the number 21?

   Formula:Place Value

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

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6. 6.

   What is 9 + 8?

   Formula:Addition

   $\text{sum} = a + b$

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7. 7.

   Subtract 7 from 88.

   Formula:Subtraction

   $\text{difference} = a - b$

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8. 8.

   What is half of 34?

   Formula:Halving

   $h = n \div 2$

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9. 9.

   How many tens are there in the number 74?

   Formula:Place Value

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

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10. 10.

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

    Formula:Missing Addend

    $b = \text{total} - a$

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11. 11.

    Subtract 31 from 36.

    Formula:Subtraction

    $\text{difference} = a - b$

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12. 12.

    How many tens are there in the number 34?

    Formula:Place Value

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

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13. 13.

    Add 9 + 19 + 3.

    Formula:Addition of Three Numbers

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

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14. 14.

    Continue the pattern by counting in 3s: 9, 12, ___

    Formula:Skip Counting

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

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15. 15.

    Subtract 43 from 90.

    Formula:Subtraction

    $\text{difference} = a - b$

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16. 16.

    There are 6 bags with 7 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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17. 17.

    What is 15 − 8?

    Formula:Subtraction

    $\text{difference} = a - b$

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18. 18.

    Add 66 and 40.

    Formula:Addition

    $\text{sum} = a + b$

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19. 19.

    What is 4 × 7?

    Formula:Multiplication (Times Tables)

    $\text{product} = a \times b$

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20. 20.

    There are 2 bags with 5 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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