this presentation is based on key maths 7 (1) press the left mouse button to move on
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This presentation is based on
KEY MATHS 7 (1)
Press the LEFT mouse button to move on
Section 9Percentages
Example 1
To find 12% of an amount.
First find 1% by dividing the amount by 100
Then find 12% by multiplying the answer by 12
Percent means OUT OF 100
Sale 12% cash back
Section 9PercentagesExample 2
To find 40% of £24.
First find 1%
(by dividing £24 by 100 = £0.24)
Then find 40%
(by multiplying £0.24 by 40)
= £9.60
Section 9PercentagesExample 3
To work out what percentage one number is of another
Write the number as a fraction
Change the fraction to a decimal
Change the decimal to a percentage
What percentage is 15 of 80?
1580
(15 ÷ 80)
0.1875
(0.1875 x 100)
18.75%
Section 9PercentagesExample 4
Change 4/5 to a decimal and a percentage
4/5 to a decimal
(4 ÷ 5)
0.8
0.8 to a percentage
(0.8 x 100)
80%
Section 9PercentagesExample 5
Change 80% to a fraction
80% to a fraction
(80 ÷ 100)
80100
= 80100
45
=