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Starter Questions

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**To understand how to calculate a percentage using a calculator.**

Percentages (Calculator) Learning Intention To understand how to calculate a percentage using a calculator.

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**Percentages (using a calculator)**

By converting a percentage to fraction form, we can work out a percentage of an amount using a calculator. Suppose we want to work out 38% of £65. 38 38% = = 38 ÷ 100 100 So we key in: Remember money is 2 decimal places 3 8 8 ÷ 1 × 6 5 = Explain that by converting the percentage to a decimal we can also work out percentages on a calculator. It would be quite difficult to work out 38% of £65 without a calculator. We can estimate the answer by working out 40% of £65. 10% of £65 is £6.50 so 40% is 4 × £6.50 = £26. What is 38% as a decimal? Ask pupils how we would write 24.7 in pounds before revealing the answer. And get an answer of 24.7. We write the answer as £24.70.

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**Percentages (using a calculator)**

By initially writing a percentage as a decimal, we can work out a percentage using a calculator. Suppose we want to work out 57% of £80. 57% = 0.57 So we key in: Remember money is 2 decimal places . 5 7 × 8 = Explain that by converting the percentage to a decimal we can also work out percentages on a calculator. It would be quite difficult to work out 38% of £65 without a calculator. We can estimate the answer by working out 40% of £65. 10% of £65 is £6.50 so 40% is 4 × £6.50 = £26. What is 38% as a decimal? Ask pupils how we would write 24.7 in pounds before revealing the answer. And get an answer of 45.6. We write the answer as £45.60.

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**Percentages (using a calculator)**

Example You have to pay 8% of tax on fuel bills. Calculate 8% of the following amounts a) £250 b) £360 c) £190 d) £550

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Percentages Now try Ex 2.2 Ch2 Pg 14

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