In this activity, we need to try to remember that:
1/10 = 0.1 = 10%
2/10 = 0.2 = 20%
3/10 = 0.3 = 30% etc.
1/25 = 0.04 = 4%
1/50 = 0.02 = 2%
Example 1
Jack has £40 and spends 30% of it.
How much does he have left?
Answer
30% = 3/10
First, find 3/10 of £40.
1/10 of £40 = £40 ÷ 10 = £4
So 3/10 of £40 = 3 × £4 = £12.
So Jack spends £12 and has £40 - £12 = £28 left.
Example 2
Which is bigger, 4/10 of £100 or 4% of £1,000?
1/10 of £100 = £100 ÷ 10 = £10
4/10 of £100 = 4 × £10 = £40
4% = 1/25
1/25 of £1,000 = £1,000 ÷ 25 = £40
They are the same.
Let's have a go at some questions now.
View the activity introduction for more information on the topic
Read the question aloud
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Question
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Teacher explanation