Ecuador · Grado 3 · Practice Sheet 9

1. 1.

   Add 13 + 5 + 20.

   Formula:Addition of Three Numbers

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

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2. 2.

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

   Formula:Skip Counting

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

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3. 3.

   Add 19 + 13 + 18.

   Formula:Addition of Three Numbers

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

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4. 4.

   You have $7 and $9. How much money do you have altogether?

   Formula:Adding Money

   $\text{total} = a + b$

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5. 5.

   Add 10 + 20 + 11.

   Formula:Addition of Three Numbers

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

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6. 6.

   Continue the pattern by counting in 3s: 9, 12, ___

   Formula:Skip Counting

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

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7. 7.

   You have $4 and $8. How much money do you have altogether?

   Formula:Adding Money

   $\text{total} = a + b$

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8. 8.

   Fill in the missing number: 15 + ___ = 23.

   Formula:Missing Addend

   $b = \text{total} - a$

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9. 9.

   Continue the pattern by counting in 3s: 3, 6, ___

   Formula:Skip Counting

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

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10. 10.

    What is double 2?

    Formula:Doubling

    $d = 2 \times n$

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11. 11.

    Continue the pattern by counting in 3s: 9, 12, ___

    Formula:Skip Counting

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

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12. 12.

    What is double 9?

    Formula:Doubling

    $d = 2 \times n$

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13. 13.

    Add 15 + 12 + 11.

    Formula:Addition of Three Numbers

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

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14. 14.

    What is half of 26?

    Formula:Halving

    $h = n \div 2$

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15. 15.

    What is 2 × 9?

    Formula:Multiplication (Times Tables)

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

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16. 16.

    How many tens are there in the number 84?

    Formula:Place Value

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

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17. 17.

    18 sweets are shared equally among 3 children. How many does each child get?

    Formula:Division (Equal Sharing)

    $\text{each} = \text{total} \div \text{groups}$

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18. 18.

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

    Formula:Missing Addend

    $b = \text{total} - a$

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19. 19.

    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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20. 20.

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

    Formula:Adding Money

    $\text{total} = a + b$

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