Cambodia · Grade 3 · Practice Sheet 30

1. 1.

   Add 19 + 8 + 16.

   Formula:Addition of Three Numbers

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

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2. 2.

   What is double 20?

   Formula:Doubling

   $d = 2 \times n$

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3. 3.

   Add 12 and 48.

   Formula:Addition

   $\text{sum} = a + b$

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4. 4.

   What is double 11?

   Formula:Doubling

   $d = 2 \times n$

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5. 5.

   What is half of 34?

   Formula:Halving

   $h = n \div 2$

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6. 6.

   You have ៛ 1 and ៛ 3. How much money do you have altogether?

   Formula:Adding Money

   $\text{total} = a + b$

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7. 7.

   There are 6 bags with 6 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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8. 8.

   Continue the pattern by counting in 3s: 12, 15, ___

   Formula:Skip Counting

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

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9. 9.

   Fill in the missing number: 5 + ___ = 10.

   Formula:Missing Addend

   $b = \text{total} - a$

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10. 10.

    Subtract 24 from 40.

    Formula:Subtraction

    $\text{difference} = a - b$

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11. 11.

    Add 82 and 23.

    Formula:Addition

    $\text{sum} = a + b$

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12. 12.

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

    Formula:Skip Counting

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

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13. 13.

    What is 8 × 5?

    Formula:Multiplication (Times Tables)

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

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14. 14.

    What is double 2?

    Formula:Doubling

    $d = 2 \times n$

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15. 15.

    There are 3 bags with 6 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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16. 16.

    Continue the pattern by counting in 5s: 0, 5, ___

    Formula:Skip Counting

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

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17. 17.

    What is double 23?

    Formula:Doubling

    $d = 2 \times n$

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18. 18.

    Fill in the missing number: 9 + ___ = 22.

    Formula:Missing Addend

    $b = \text{total} - a$

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19. 19.

    What is half of 42?

    Formula:Halving

    $h = n \div 2$

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20. 20.

    Add 7 + 13 + 5.

    Formula:Addition of Three Numbers

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

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