# 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 9 Percentages 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 9 Percentages Example 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 9 Percentages Example 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? ¬ 15 80 ­ (15 ÷ 80) 0.1875 ® (0.1875 x 100) 18.75%

Section 9 Percentages Example 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 9 Percentages Example 5 Change 80% to a fraction 80% to a fraction (80 ÷ 100) 80 100 = 80 100 4 5 =

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