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Published byPiers Harvey Modified over 7 years ago

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THOAN

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THOAN Think of a number…

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THOAN Multiply it by 3

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THOAN Think of a number… Multiply it by 3 Add 7

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What is your answer?

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x Think of a number…

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3x Multiply it by 3

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3x + 7 = Think of a number… Multiply it by 3 Add 7

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To find the number you first thought of, go backwards through this PowerPoint presentation and undo the calculations you made

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Try another one

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x Think of a number…

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5x Multiply it by 5

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5x - 2 = Think of a number… Multiply it by 5 Subtract 2

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What is your answer?

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x Think of a number…

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10x Multiply it by 10

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10x + 5 = Think of a number… Multiply it by 10 Add 5

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What is your answer?

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Try another one

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x Think of a number…

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2x Multiply it by 3

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2x + 30 = Think of a number… Multiply it by 2 Add 30

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What is your answer?

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Try another one

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x Think of a number…

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5x Multiply it by 5

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5x - 1 = Think of a number… Multiply it by 5 Take away 1

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What is your answer?

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Try another one

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x Think of a number…

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9x Multiply it by 9

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9x - 7 = Think of a number… Multiply it by 9 Take away 7

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What is your answer?

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x Think of a number…

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X + 3 Think of a number… Add 3

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4(x + 3) = Think of a number… Add 3 Multiply by 4

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What is your answer?

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Solving Equations What you are doing is solving equations. Here’s a nice way to set out your work…..

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Simple Equations 5x + 17 = 62 (Take 17 from both sides) 5x = 45 (Divide both sides by 5) x = 9 x = 9

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Simple Equations 3x + 8 = 29 (Take 8 from both sides) 3x = 21 (Divide both sides by 3) x = 7 x = 7

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Simple Equations 6x - 5 = 55 (Add 5 to both sides) 6x = 60 (Divide both sides by 6) x = 10 x = 10

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