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

## Presentation on theme: "Calculating percentages of amounts no calculator ©Mathematics Education Centre, Loughborough University."— Presentation transcript:

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% ÷ 10 1 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 = 1.2 + 1.2 + 1.2 = 3.6 Divide by 100 1%1%+ 1% ©Mathematics Education Centre, Loughborough University

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