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Practice - Percentages, Ratios and Proportion - 03

Welcome KS3 Students! It's time to put your knowledge of percentages, ratios and proportion to the test. Don't worry, this won't be a boring maths lesson, we promise. Think of it as a cool way to test your numeracy skills. So, brace yourself, let the fun commence and let's see how many of these 10 questions you can crack!
1 .
What is the proportion of 20 out of 100 represented as a decimal?
0.02
0.2
2
20
20 out of 100 as a decimal is 0.2.
2 .
If water makes up 70% of a person's body weight and a person weighs 50kg, how much of their weight is water?
25 kg
30 kg
35 kg
40 kg
70% of 50kg is (0.70 x 50) = 35 kg.
3 .
The ratio of boys to girls in a class is 5:3. If there are 15 girls, how many boys are there?
20
25
30
35
The ratio 5:3 means for every 5 boys there are 3 girls. If there are 15 girls, the number of boys would be (15 ÷ 3) x 5 = 25 boys.
4 .
A pizza is sliced into 8 pieces. What fraction of the pizza is 3 slices?
38
35
13
58
3 out of 8 slices represent 38 of the pizza.
5 .
What is the decimal equivalent of 45%?
0.045
0.45
4.5
45
The decimal equivalent of 45% is 0.45.
6 .
The ratio of blue to red balls in a bag is 3:7. If there are 28 red balls, how many blue balls are there?
8
10
12
14
The ratio 3:7 means for every 3 blue balls there are 7 red ones. If there are 28 red balls, the number of blue balls would be (28 ÷ 7) x 3 = 12 blue balls.
7 .
The ratio of cats to dogs in a park is 3:4. If there are 24 dogs, how many cats are there?
18
21
27
32
The ratio 3:4 means for every 3 cats there are 4 dogs. If there are 24 dogs, the number of cats would be (24 ÷ 4) x 3 = 18 cats.
8 .
What is 40% of £50?
£10
£20
£15
£25
40% of 50 is calculated as (0.40 x 50) = £20
9 .
What is 15% of 90kg?
9 kg
10.5 kg
13.5 kg
15 kg
15% of 90 is calculated as (0.15 x 90) = 13.5 kg
10 .
If a dress originally costing £60 is reduced by 15%, how much is the dress now?
£45
£50
£51
£55
15% of 60 is £9. So the dress is now £60 - £9 = £51.
Author:  Graeme Haw

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