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Published byMelanie Holden Modified over 3 years ago

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Objectives: Calculate percentages using non-calculator methods. Calculate percentages less than 10% and values other than multiples of 10. Vocabulary:

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4050012070 5025072060 901408601800 205000300480 T3.1B 20 is 50% of 40. 500 is 10% of 5000 Find three more percentage relationships on the target board. 50 is 20% of 250 120 is 25% of 480 90 is 5% of 1800 70 is 50% of 140 60 is 50% of 120 120 is 40% of 300 250 is 50% of 500 90 is 75% of 120

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What is 10% of £380? How did you work out 10% of £380? How can you use the answer for 10% to find 20%? 20% = 10% + 10% = £38 + £38 = £76 How can you use 10% to find 30%? 30% = 10% + 10% + 10% = 3 x £38 = £114

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60 10% 20% 30% 40% 50% 60% On a copy of the spider diagram fill in the amounts. W/S 3.1B

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60 10% 20% 30% 40% 50% 60% 6 12 1824 30 36 Answers:

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How many times will 5% fit into 10%? How can you work out 5% if you know 10%? Find 5% of £240 – explain how you got your answer. 10% of £240 is £24so 5% of £240 is £12. Find 5% of £720 – explain how you got the answer. 10% of £720 is £72 so 5% of £720 is £36 0% 100% 0£240 10% £24

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400501200700 5002472600 80140401800 20800300120 T3.2B Find 5% of each amount as it is highlighted

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How can you find 15% of an amount? 15% can be found by adding 10% and 5% together. Find 15% of 300 – explain your working. 10% of 300 is 305% of 300 is 1515% is 30 + 15 = 45 0%100% 0 300 10% 30 15% 45

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400501200700 5002472600 80140401800 20800300120 Find 15% of each number as it is highlighted. T3.2B

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60 15% 25% 10% 5% 45% 55% 35% 95% 17.5% Complete a spider diagram like the one above. W/S3.2B

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60 15% 25% 10% 5% 45% 55% 35% 95% 17.5% Answers 6 915 3 27 33 21 57 10.5

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If I can find 10% how can I find 1%? Example: Find 1% of £350 1% is the same as 1/100 th so I can divide by 100 £350 ÷ 100 = £3.5 written £3.50 1% is 10% divided by 10. 10% of £350 is £35 so 1% is £35 ÷10 = £3.5 or £3.50 Method 1 Method 2

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4050012070 5025072060 901408601800 205000300480 State 1% of each number as it is highlighted. T3.1B

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Objectives: Calculate percentages using non-calculator methods. Calculate percentages less than 10% and values other than multiples of 10. Vocabulary:

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Thank you for your attention

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