South Korea · Grade 4 · Practice Sheet 1

1. 1.

   An item costs ₩7.24 and you pay with ₩10. How much change do you get?

   Formula:Change Due

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

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2. 2.

   32 sweets are shared equally among 4 children. How many does each child get?

   Formula:Division (Equal Sharing)

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

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3. 3.

   Calculate 150 ÷ 6.

   Formula:Division

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

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4. 4.

   Calculate 16 × 10.

   Formula:Multiplication

   $p = a \times b$

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5. 5.

   An item costs ₩28.8 and you pay with ₩40. How much change do you get?

   Formula:Change Due

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

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6. 6.

   A rectangle is 26 cm long and 14 cm wide. Find its area.

   Formula:Area of a Rectangle

   $A = l \times w$

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7. 7.

   Convert 4.15 kilometres into metres.

   Formula:Metric Length Conversion

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

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8. 8.

   Find the perimeter of a rectangle measuring 35 m by 28 m.

   Formula:Perimeter of a Rectangle

   $P = 2(l + w)$

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9. 9.

   A rectangle is 35 cm long and 25 cm wide. Find its area.

   Formula:Area of a Rectangle

   $A = l \times w$

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10. 10.

    An item costs ₩7.1 and you pay with ₩20. How much change do you get?

    Formula:Change Due

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

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11. 11.

    One item costs ₩9.68. Find the total cost of 16 items.

    Formula:Total Cost

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

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12. 12.

    Calculate 19 × 3.

    Formula:Multiplication

    $p = a \times b$

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13. 13.

    Find 1/2 of 28.

    Formula:Fraction of a Quantity

    $\text{result} = \dfrac{a}{b} \times N$

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14. 14.

    Convert 1.91 kilometres into metres.

    Formula:Metric Length Conversion

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

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15. 15.

    An item costs ₩9.14 and you pay with ₩10. How much change do you get?

    Formula:Change Due

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

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16. 16.

    A rectangle is 35 cm long and 13 cm wide. Find its area.

    Formula:Area of a Rectangle

    $A = l \times w$

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17. 17.

    Find 1/2 of 8.

    Formula:Fraction of a Quantity

    $\text{result} = \dfrac{a}{b} \times N$

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18. 18.

    Find the mean (average) of these numbers: 14, 29, 72, 10, 48.

    Formula:Arithmetic Mean

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

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19. 19.

    Calculate 53 × 10.

    Formula:Multiplication

    $p = a \times b$

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20. 20.

    Find the perimeter of a rectangle measuring 19 m by 23 m.

    Formula:Perimeter of a Rectangle

    $P = 2(l + w)$

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