South Korea · Grade 2 · Practice Sheet 9

1. 1.

   What is half of 34?

   Formula:Halving

   $h = n \div 2$

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2. 2.

   What is 10 − 3?

   Formula:Subtraction

   $\text{difference} = a - b$

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3. 3.

   Add 13 + 18 + 17.

   Formula:Addition of Three Numbers

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

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4. 4.

   Fill in the missing number: 9 + ___ = 23.

   Formula:Missing Addend

   $b = \text{total} - a$

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5. 5.

   What is double 9?

   Formula:Doubling

   $d = 2 \times n$

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6. 6.

   How many tens are there in the number 15?

   Formula:Place Value

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

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7. 7.

   What is double 19?

   Formula:Doubling

   $d = 2 \times n$

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8. 8.

   What is 8 × 2?

   Formula:Multiplication (Times Tables)

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

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9. 9.

   Fill in the missing number: 4 + ___ = 12.

   Formula:Missing Addend

   $b = \text{total} - a$

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10. 10.

    What is double 15?

    Formula:Doubling

    $d = 2 \times n$

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11. 11.

    What is half of 20?

    Formula:Halving

    $h = n \div 2$

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12. 12.

    What is double 7?

    Formula:Doubling

    $d = 2 \times n$

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13. 13.

    How many tens are there in the number 63?

    Formula:Place Value

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

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14. 14.

    What is 8 × 7?

    Formula:Multiplication (Times Tables)

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

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15. 15.

    Add 43 and 46.

    Formula:Addition

    $\text{sum} = a + b$

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16. 16.

    What is 9 + 3?

    Formula:Addition

    $\text{sum} = a + b$

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17. 17.

    Fill in the missing number: 11 + ___ = 20.

    Formula:Missing Addend

    $b = \text{total} - a$

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18. 18.

    You have ₩2 and ₩9. How much money do you have altogether?

    Formula:Adding Money

    $\text{total} = a + b$

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19. 19.

    What is 9 × 9?

    Formula:Multiplication (Times Tables)

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

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20. 20.

    There are 2 bags with 4 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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