Using a calculator to find percentages 1 - BBC
N2/L1.10
Using a calculator to find percentages 1
You can work out any percentage increase or decrease using a calculator. This factsheet shows how to do it one way. The factsheet Using a calculator to find percentages 2 shows a different method. See which you prefer. In this factsheet the method is:
Example A coat costing ?80 has been reduced by 15% in a sale. Find the new price. This takes two steps on a calculator. First find 15% of ?80 by typing in the sum below:
This uses the decimal method.
The answer is 12. So 15% of ?80 is ?12. Now work out the sale price by taking ?12 from ?80:
The correct answer is ?68. Here are some more examples. Use your calculator to practise the steps.
Original price
?40 ?36 ?56 ?110
Percentage change
35% increase 12% increase 7% decrease 55% decrease
Find percentage amount
35 ? 100 ? 40
12 ? 100 ? 36
7 ? 100 ? 56
55 ? 100 ? 110
Percentage Add or take New price
amount
away?
?14 ?4.32 ?3.92 ?60.50
Add Add Take away Take away
?54 ?40.32 ?52.08 ?49.50
? BBC 2011
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