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Published byLeon Moore Modified over 2 years ago

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Percentages Recap

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Calculating Percentages Method 1Method 2 Caluclate percentages in your head by dividing them up into ones you know. Eg, 29% of 85 10% of 85 = 8.5 30% of 85 = 8.5 × 3 = 25.5 1% of 85% = 0.85 29% = 25.5 – 0.85 = 24.65 Caluclate percentages using a calculator by turning the percentage into a decimal. Eg, 29% of 85 2910085÷× = 24.65

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Now try some questions without using a calculator. (Method 1.)

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15% 45% 17.5% 14% 78% 19% 110% 81% £10.95 £32.85 £59.13 £80.30 £13.87 £56.94 £10.22 £12.78

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Now try some questions using a calculator. (Method two.)

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Questions Difficult a)42% of £500 b)63% of 400 c)31% of £800 d)59% of £700 e)22% of £900 f)48% of £650 g)76% of £850 h)94% of £250 Medium a)30% of 500 b)76% of 200 c)55% of 120 d)81% of 240 e)35% of 80 f)45% of 60 g)95% of 130 h)19% of 300 Easy a)15% of 200 b)26% of 400 c)5% of 700 d)20% of 50 e)60% of 140 f)40% of 30 g)15% of 60 h)45% of 80 30 104 35 10 84 12 9 36 150 152 66 194.4 28 27 123.5 57 210 252 248 413 198 312 646 235

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Scientific Notation 1. Scientific notation is a way to shorten a large number (makes using it in calculations easier) 2.

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