Mongolia · Grade 6 · Practice Sheet 20

1. 1.

   A rectangle is 4 cm long and 10 cm wide. Find its area.

   Formula:Area of a Rectangle

   $A = l \times w$

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2. 2.

   Find the perimeter of a rectangle measuring 16 m by 6 m.

   Formula:Perimeter of a Rectangle

   $P = 2(l + w)$

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3. 3.

   Calculate 78 × 11.

   Formula:Multiplication

   $p = a \times b$

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4. 4.

   A rectangle is 8 cm long and 14 cm wide. Find its area.

   Formula:Area of a Rectangle

   $A = l \times w$

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5. 5.

   Find the mean (average) of these numbers: 93, 10, 14, 72, 38, 94.

   Formula:Arithmetic Mean

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

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6. 6.

   Find the perimeter of a rectangle measuring 5 m by 6 m.

   Formula:Perimeter of a Rectangle

   $P = 2(l + w)$

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7. 7.

   Calculate 320 ÷ 8.

   Formula:Division

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

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8. 8.

   Calculate 62 × 6.

   Formula:Multiplication

   $p = a \times b$

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9. 9.

   Calculate 72 ÷ 3.

   Formula:Division

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

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10. 10.

    Find the perimeter of a rectangle measuring 31 m by 7 m.

    Formula:Perimeter of a Rectangle

    $P = 2(l + w)$

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11. 11.

    An item costs ₮33.04 and you pay with ₮50. How much change do you get?

    Formula:Change Due

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

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12. 12.

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

    Formula:Area of a Square

    $A = s^2$

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13. 13.

    ₮2,300 is invested at 10% simple interest per year for 4 years. Find the interest earned.

    Formula:Simple Interest

    $I = \dfrac{P \times r \times t}{100}$

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14. 14.

    Find 2/5 of 20.

    Formula:Fraction of a Quantity

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

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15. 15.

    What is 75% of 210?

    Formula:Percentage of a Quantity

    $\text{result} = \dfrac{p}{100} \times N$

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16. 16.

    Calculate 126 ÷ 9.

    Formula:Division

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

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17. 17.

    A triangle has a base of 24 cm and a height of 5 cm. Find its area.

    Formula:Area of a Triangle

    $A = \tfrac{1}{2} b h$

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18. 18.

    ₮238 is shared in the ratio 5 : 2. Find each share.

    Formula:Dividing in a Ratio

    $\text{share} = \dfrac{\text{part}}{\text{total parts}} \times T$

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19. 19.

    ₮4,000 is invested at 5% simple interest per year for 3 years. Find the interest earned.

    Formula:Simple Interest

    $I = \dfrac{P \times r \times t}{100}$

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20. 20.

    Find the perimeter of a rectangle measuring 35 m by 25 m.

    Formula:Perimeter of a Rectangle

    $P = 2(l + w)$

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