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Y9 Booster. Lesson 3. Objectives – what we should be able to do by the end of the lesson. Calculate percentages of quantities using a calculator Calculate percentage increases and decreases. Percentage target board 1 M3.1. by. Percentage target board 1 M3.1. by. 5% is. 15g. Increase.

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## Y9 Booster

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**Y9 Booster**Lesson 3**Objectives – what we should be able to do by the end of**the lesson • Calculate percentages of quantities using a calculator • Calculate percentage increases and decreases**5% is**15g Increase 300 g by 15% 10% is 30g 15% is 10% + 5% = 30g + 15g = 45g 300g + 15% = 300g + 45g = 345g**2.5% is 1.75cm**by 12.5% Decrease 70 cm 10% is 7 cm 12.5% is 10% + 2.5% = 7 cm + 1.75 cm = 8.75 cm 70 cm – 12.5% = 70 cm – 8.75 cm = 61.25 cm**100%**15% £25 15% Using a calculator: A 15% increase: 115% 1.15 1 + 0.15 Increase £25 by 15%: 25 x 1.15 = £28.75**100%**12.5% Decrease 3km by 12.5%: 1 – 0.125 = 0.875 ( we need to find 87.5%) Decrease 3 km by 12.5% = 3 x 0.875 = 2.625 km**Percentage target board 2 M3.2**by Calculation: 350 x 1.17**Percentage target board 2 M3.2**by Calculation: 83 x 1.38**Percentage target board 2 M3.2**by Calculation: 12.5 x 0.835**Percentage target board 2 M3.2**by Calculation: 70 x 0.89**Percentage target board 2 M3.2**by Calculation: 650 x 2.2**Percentage target board 2 M3.2**by Calculation: 70 x - 0.2**Objectives – how have we done?**• Calculate percentages of quantities using a calculator • Calculate percentage increases and decreases

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