Decimals and percentages · Ages 11–12

Percentages of an amount worksheet

Part of: Percentages

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Decimals and percentages · Ages 11–12

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Name:Date:Score:／48

Write each answer in the space. For word problems, show your working and write a sentence answer.

13.A sports club has 300 members, and 5% of them took part in the swimming gala. How many members took part?
Working:
Answer:
14.Chi-keung had $200 and spent 50% of it. How many dollars does he have left?
Working:
Answer:
15.A sports club has 400 members, and 20% of them took part in the swimming gala. How many members took part?
Working:
Answer:
16.Ka-yan had $80 and spent 20% of it. How many dollars does she have left?
Working:
Answer:
17.A jacket used to cost $60. Now it is 10% off. How many dollars cheaper is it?
Working:
Answer:
18.A jacket used to cost $40. Now it is 10% off. How many dollars cheaper is it?
Working:
Answer:

Show the answers and working

Percentages of an amount worksheet: Answers and working

1. 20% of 80 = 16
20% of 80: find 10% first, 80 ÷ 10 = 8, 20% is double 10%, 8 × 2 = 16
2. 75% of 60 = 45
75% of 60: 75% is 50% + 25%, 60 ÷ 2 = 30, 60 ÷ 4 = 15, 30 + 15 = 45
3. 10% of 20 = 2
10% of 20: 10% is 20 ÷ 10 = 2
4. 20% of 40 = 8
20% of 40: find 10% first, 40 ÷ 10 = 4, 20% is double 10%, 4 × 2 = 8
5. 20% of 240 = 48
20% of 240: find 10% first, 240 ÷ 10 = 24, 20% is double 10%, 24 × 2 = 48
6. 10% of 60 = 6
10% of 60: 10% is 60 ÷ 10 = 6
7. 5% of 200 = 10
5% of 200: find 10% first, 200 ÷ 10 = 20, 5% is half of 10%, 20 ÷ 2 = 10
8. 5% of 240 = 12
5% of 240: find 10% first, 240 ÷ 10 = 24, 5% is half of 10%, 24 ÷ 2 = 12
9. 25% of 40 = 10
25% of 40: 25% is a quarter of the whole, 40 ÷ 4 = 10
10. 10% of 200 = 20
10% of 200: 10% is 200 ÷ 10 = 20
11. 25% of 300 = 75
25% of 300: 25% is a quarter of the whole, 300 ÷ 4 = 75
12. 20% of 160 = 32
20% of 160: find 10% first, 160 ÷ 10 = 16, 20% is double 10%, 16 × 2 = 32

Marking: 2 for the working, 1 for the answer, 1 for the sentence.

13. A sports club has 300 members, and 5% of them took part in the swimming gala. How many members took part? (Answer: 15 members)
300 × 5 ÷ 100 = 15
14. Chi-keung had $200 and spent 50% of it. How many dollars does he have left? (Answer: 100 dollars)
200 × 50 ÷ 100 = 100; 200 − 200 × 50 ÷ 100 = 100
15. A sports club has 400 members, and 20% of them took part in the swimming gala. How many members took part? (Answer: 80 members)
400 × 20 ÷ 100 = 80
16. Ka-yan had $80 and spent 20% of it. How many dollars does she have left? (Answer: 64 dollars)
80 × 20 ÷ 100 = 16; 80 − 80 × 20 ÷ 100 = 64
17. A jacket used to cost $60. Now it is 10% off. How many dollars cheaper is it? (Answer: 6 dollars)
60 × 10 ÷ 100 = 6
18. A jacket used to cost $40. Now it is 10% off. How many dollars cheaper is it? (Answer: 4 dollars)
40 × 10 ÷ 100 = 4

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