Calculating percentages of amounts no calculator ©Mathematics Education Centre, Loughborough University

Strategy Remember 1%=1/100 10%=10/100=1/10 Represent all percentages as combinations of 1% and 10% eg. 13%=10%+1%+1%+1% ©Mathematics Education Centre, Loughborough University divide by 100 divide by 10

1% Divide by 100 ©Mathematics Education Centre, Loughborough University

10% ÷ = 1 ©Mathematics Education Centre, Loughborough University

10% Divide by 10 ©Mathematics Education Centre, Loughborough University

3% of 120 3% = 1% of 120= 1.2 3% of 120 = = 3.6 Divide by 100 1%1%+ 1% ©Mathematics Education Centre, Loughborough University

12% of % = 10% of 250= 25 12% of 250 = = 30 Divide by 10 10%+ 1% 1% of 250 = 2.5 Divide by 100 ©Mathematics Education Centre, Loughborough University