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Vietnam · Grade 7 · Practice Sheet 21

Sheet code: VIETNAM-G7-S21 · 20 questions

Name: ______________
Date: ______________
  1. 1.

    Find the circumference of a circle whose radius is 22 m. (Use π ≈ 3.14159)

    Formula:Circumference of a Circle
    C=2πrC = 2\pi r
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  2. 2.

    A value changes from 178 to 65. Find the percentage change (to 2 d.p.).

    Formula:Percentage Change
    % change=new−oldold×100\%\,\text{change} = \dfrac{\text{new} - \text{old}}{\text{old}} \times 100
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  3. 3.

    A car travels 228 km in 4 hours. Find its average speed.

    Formula:Speed
    v=dtv = \dfrac{d}{t}
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  4. 4.

    A bag has 19 equally likely marbles, of which 16 are red. Find the probability of drawing a red marble (to 3 d.p.).

    Formula:Simple Probability
    P(E)=favourabletotalP(E) = \dfrac{\text{favourable}}{\text{total}}
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  5. 5.

    Solve for x: 3x + 8 = 20.

    Formula:Solving a Linear Equation
    x=c−bax = \dfrac{c - b}{a}
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  6. 6.

    A train moves at 22 km/h for 3.9 hours. How far does it travel?

    Formula:Distance from Speed & Time
    d=v×td = v \times t
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  7. 7.

    VND 85 is shared in the ratio 4 : 1. Find each share.

    Formula:Dividing in a Ratio
    share=parttotal parts×T\text{share} = \dfrac{\text{part}}{\text{total parts}} \times T
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  8. 8.

    A car travels 342 km in 6 hours. Find its average speed.

    Formula:Speed
    v=dtv = \dfrac{d}{t}
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  9. 9.

    A value changes from 172 to 120. Find the percentage change (to 2 d.p.).

    Formula:Percentage Change
    % change=new−oldold×100\%\,\text{change} = \dfrac{\text{new} - \text{old}}{\text{old}} \times 100
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  10. 10.

    VND 204 is shared in the ratio 1 : 5. Find each share.

    Formula:Dividing in a Ratio
    share=parttotal parts×T\text{share} = \dfrac{\text{part}}{\text{total parts}} \times T
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  11. 11.

    Find 2/5 of 60.

    Formula:Fraction of a Quantity
    result=ab×N\text{result} = \dfrac{a}{b} \times N
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  12. 12.

    Convert 11.28 kilometres into metres.

    Formula:Metric Length Conversion
    1 km=1000 m1\,\text{km} = 1000\,\text{m}
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  13. 13.

    A value changes from 188 to 149. Find the percentage change (to 2 d.p.).

    Formula:Percentage Change
    % change=new−oldold×100\%\,\text{change} = \dfrac{\text{new} - \text{old}}{\text{old}} \times 100
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  14. 14.

    Find the perimeter of a rectangle measuring 9 m by 28 m.

    Formula:Perimeter of a Rectangle
    P=2(l+w)P = 2(l + w)
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  15. 15.

    A train moves at 94 km/h for 1.9 hours. How far does it travel?

    Formula:Distance from Speed & Time
    d=v×td = v \times t
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  16. 16.

    A circle has a radius of 23 cm. Find its area. (Use π ≈ 3.14159)

    Formula:Area of a Circle
    A=πr2A = \pi r^2
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  17. 17.

    Find the circumference of a circle whose radius is 10 m. (Use π ≈ 3.14159)

    Formula:Circumference of a Circle
    C=2πrC = 2\pi r
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  18. 18.

    A car travels 196 km in 4 hours. Find its average speed.

    Formula:Speed
    v=dtv = \dfrac{d}{t}
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  19. 19.

    What is 50% of 310?

    Formula:Percentage of a Quantity
    result=p100×N\text{result} = \dfrac{p}{100} \times N
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  20. 20.

    Find 1/2 of 30.

    Formula:Fraction of a Quantity
    result=ab×N\text{result} = \dfrac{a}{b} \times N
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