South Africa · Grade 4 · Practice Sheet 15

1. 1.

   Find the mean (average) of these numbers: 78, 13, 20, 29, 15.

   Formula:Arithmetic Mean

   $\bar{x} = \dfrac{\sum x}{n}$

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2. 2.

   Calculate 86 × 4.

   Formula:Multiplication

   $p = a \times b$

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3. 3.

   Find the area of a square with side length 7 cm.

   Formula:Area of a Square

   $A = s^2$

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4. 4.

   One item costs R18.24. Find the total cost of 10 items.

   Formula:Total Cost

   $\text{total} = \text{price} \times \text{quantity}$

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5. 5.

   Calculate 71 × 7.

   Formula:Multiplication

   $p = a \times b$

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6. 6.

   Find the area of a square with side length 30 cm.

   Formula:Area of a Square

   $A = s^2$

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7. 7.

   An item costs R42.29 and you pay with R60. How much change do you get?

   Formula:Change Due

   $\text{change} = \text{paid} - \text{cost}$

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8. 8.

   Calculate 99 × 10.

   Formula:Multiplication

   $p = a \times b$

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9. 9.

   One item costs R14.24. Find the total cost of 9 items.

   Formula:Total Cost

   $\text{total} = \text{price} \times \text{quantity}$

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10. 10.

    Calculate 61 × 4.

    Formula:Multiplication

    $p = a \times b$

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11. 11.

    Calculate 64 ÷ 8.

    Formula:Division

    $q = \dfrac{a}{b}$

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12. 12.

    18 sweets are shared equally among 6 children. How many does each child get?

    Formula:Division (Equal Sharing)

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

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13. 13.

    Calculate 120 ÷ 4.

    Formula:Division

    $q = \dfrac{a}{b}$

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14. 14.

    Find the area of a square with side length 21 cm.

    Formula:Area of a Square

    $A = s^2$

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15. 15.

    Convert 2.77 kilometres into metres.

    Formula:Metric Length Conversion

    $1\,\text{km} = 1000\,\text{m}$

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16. 16.

    Calculate 170 ÷ 5.

    Formula:Division

    $q = \dfrac{a}{b}$

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17. 17.

    Find the area of a square with side length 20 cm.

    Formula:Area of a Square

    $A = s^2$

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18. 18.

    Calculate 40 ÷ 5.

    Formula:Division

    $q = \dfrac{a}{b}$

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19. 19.

    Find the perimeter of a rectangle measuring 5 m by 33 m.

    Formula:Perimeter of a Rectangle

    $P = 2(l + w)$

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20. 20.

    Find the mean (average) of these numbers: 77, 71, 14, 15, 21, 62.

    Formula:Arithmetic Mean

    $\bar{x} = \dfrac{\sum x}{n}$

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