South Korea · Grade 3 · Practice Sheet 13

1. 1.

   What is 7 × 10?

   Formula:Multiplication (Times Tables)

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

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2. 2.

   Add 4 + 17 + 12.

   Formula:Addition of Three Numbers

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

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3. 3.

   Add 19 and 7.

   Formula:Addition

   $\text{sum} = a + b$

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4. 4.

   What is half of 16?

   Formula:Halving

   $h = n \div 2$

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5. 5.

   You have ₩4 and ₩9. How much money do you have altogether?

   Formula:Adding Money

   $\text{total} = a + b$

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6. 6.

   Fill in the missing number: 8 + ___ = 23.

   Formula:Missing Addend

   $b = \text{total} - a$

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7. 7.

   What is half of 38?

   Formula:Halving

   $h = n \div 2$

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8. 8.

   Add 15 and 18.

   Formula:Addition

   $\text{sum} = a + b$

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9. 9.

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

   Formula:Adding Money

   $\text{total} = a + b$

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10. 10.

    What is double 14?

    Formula:Doubling

    $d = 2 \times n$

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11. 11.

    Add 3 + 15 + 10.

    Formula:Addition of Three Numbers

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

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12. 12.

    What is 8 × 4?

    Formula:Multiplication (Times Tables)

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

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13. 13.

    There are 2 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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14. 14.

    What is double 4?

    Formula:Doubling

    $d = 2 \times n$

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15. 15.

    What is half of 18?

    Formula:Halving

    $h = n \div 2$

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16. 16.

    Subtract 38 from 76.

    Formula:Subtraction

    $\text{difference} = a - b$

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17. 17.

    You have ₩5 and ₩7. How much money do you have altogether?

    Formula:Adding Money

    $\text{total} = a + b$

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18. 18.

    How many tens are there in the number 72?

    Formula:Place Value

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

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19. 19.

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

    Formula:Skip Counting

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

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20. 20.

    Add 20 and 52.

    Formula:Addition

    $\text{sum} = a + b$

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