Mathematics: A Complete Introduction: The Easy Way to Learn Maths (Teach Yourself: Math & Science) by Hugh Neill & Trevor Johnson

Author:Hugh Neill & Trevor Johnson
Language: eng
Format: mobi
Publisher: John Murray Press
Published: 2018-06-20T22:00:00+00:00

14.5 One quantity as a percentage of another quantity

To express one quantity as a percentage of another quantity, first express it as a fraction of the other quantity. Then convert the fraction to a decimal and finally to a percentage.

Example 14.5.1

Elaine scores 52 out of 80 in a test. Express her mark as a percentage.

As a fraction, 52 out of 80 is .

Find 52 ÷ 80 to convert to a decimal, .

As a percentage 0.65 = 65%.

Spotlight

So to write 52 out of 80 as a percentage you need to work out (52 ÷ 80) × 100. You can think of ‘out of’ as meaning ‘divide by’.

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