Hong Kong · Grade 3 · Practice Sheet 33

1. 1.

   How many tens are there in the number 42?

   Formula:Place Value

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

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2. 2.

   Add 10 + 14 + 12.

   Formula:Addition of Three Numbers

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

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3. 3.

   Subtract 21 from 49.

   Formula:Subtraction

   $\text{difference} = a - b$

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4. 4.

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

   Formula:Skip Counting

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

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5. 5.

   What is half of 38?

   Formula:Halving

   $h = n \div 2$

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6. 6.

   You have HK$ 2 and HK$ 5. How much money do you have altogether?

   Formula:Adding Money

   $\text{total} = a + b$

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7. 7.

   How many tens are there in the number 31?

   Formula:Place Value

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

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8. 8.

   Fill in the missing number: 11 + ___ = 15.

   Formula:Missing Addend

   $b = \text{total} - a$

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9. 9.

   What is double 3?

   Formula:Doubling

   $d = 2 \times n$

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10. 10.

    Subtract 73 from 88.

    Formula:Subtraction

    $\text{difference} = a - b$

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11. 11.

    What is double 21?

    Formula:Doubling

    $d = 2 \times n$

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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 7 × 9?

    Formula:Multiplication (Times Tables)

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

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14. 14.

    There are 5 bags with 3 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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15. 15.

    Subtract 17 from 46.

    Formula:Subtraction

    $\text{difference} = a - b$

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16. 16.

    What is half of 44?

    Formula:Halving

    $h = n \div 2$

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17. 17.

    Subtract 83 from 93.

    Formula:Subtraction

    $\text{difference} = a - b$

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18. 18.

    Add 34 and 51.

    Formula:Addition

    $\text{sum} = a + b$

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19. 19.

    Continue the pattern by counting in 10s: 30, 40, ___

    Formula:Skip Counting

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

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20. 20.

    What is double 24?

    Formula:Doubling

    $d = 2 \times n$

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