Mathematics by Hugh Neill & Trevor Johnson
Author:Hugh Neill & Trevor Johnson
Language: eng
Format: azw3
ISBN: 9781473678361
Publisher: John Murray Press
Published: 2018-06-21T04:00:00+00:00
14.3 Percentages of quantities
You can find a percentage of a quantity mentally when the percentage has a well-known fractional equivalent and the arithmetic is simple. For example, to find 50% of 18, use the fact that and then find of 18; in other words .
Example 14.3.1
Find 75% of 24 km.
, so of
In general, to find a percentage of a quantity, write the percentage as a fraction or as a decimal; replace ‘of’ by ‘×’ and carry out the multiplication, either by hand or using a calculator.
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