Cambodia · Grade 3 · Practice Sheet 21

1. 1.

   What is half of 44?

   Formula:Halving

   $h = n \div 2$

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2. 2.

   What is double 9?

   Formula:Doubling

   $d = 2 \times n$

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3. 3.

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

   Formula:Skip Counting

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

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4. 4.

   Add 9 + 17 + 12.

   Formula:Addition of Three Numbers

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

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5. 5.

   Continue the pattern by counting in 5s: 20, 25, ___

   Formula:Skip Counting

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

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6. 6.

   What is 4 × 5?

   Formula:Multiplication (Times Tables)

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

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7. 7.

   Continue the pattern by counting in 2s: 0, 2, ___

   Formula:Skip Counting

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

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8. 8.

   Add 18 and 36.

   Formula:Addition

   $\text{sum} = a + b$

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9. 9.

   Fill in the missing number: 12 + ___ = 23.

   Formula:Missing Addend

   $b = \text{total} - a$

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10. 10.

    Subtract 15 from 60.

    Formula:Subtraction

    $\text{difference} = a - b$

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11. 11.

    Add 47 and 55.

    Formula:Addition

    $\text{sum} = a + b$

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12. 12.

    Add 3 + 8 + 14.

    Formula:Addition of Three Numbers

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

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13. 13.

    What is double 10?

    Formula:Doubling

    $d = 2 \times n$

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14. 14.

    What is 5 × 3?

    Formula:Multiplication (Times Tables)

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

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15. 15.

    Subtract 19 from 35.

    Formula:Subtraction

    $\text{difference} = a - b$

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16. 16.

    What is 6 × 5?

    Formula:Multiplication (Times Tables)

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

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17. 17.

    What is double 15?

    Formula:Doubling

    $d = 2 \times n$

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18. 18.

    You have ៛ 8 and ៛ 5. How much money do you have altogether?

    Formula:Adding Money

    $\text{total} = a + b$

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19. 19.

    How many tens are there in the number 74?

    Formula:Place Value

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

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20. 20.

    What is 3 × 4?

    Formula:Multiplication (Times Tables)

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

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