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THOAN. THOAN Think of a number… THOAN Multiply it by 3.

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Presentation on theme: "THOAN. THOAN Think of a number… THOAN Multiply it by 3."— Presentation transcript:

1 THOAN

2 THOAN Think of a number…

3 THOAN Multiply it by 3

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

5 What is your answer?

6 x Think of a number…

7 3x Multiply it by 3

8 3x + 7 = Think of a number… Multiply it by 3 Add 7

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

10 Try another one

11 x Think of a number…

12 5x Multiply it by 5

13 5x - 2 = Think of a number… Multiply it by 5 Subtract 2

14 What is your answer?

15 Try another one

16 x Think of a number…

17 10x Multiply it by 10

18 10x + 5 = Think of a number… Multiply it by 10 Add 5

19 What is your answer?

20 Try another one

21 x Think of a number…

22 2x Multiply it by 3

23 2x + 30 = Think of a number… Multiply it by 2 Add 30

24 What is your answer?

25 Try another one

26 x Think of a number…

27 5x Multiply it by 5

28 5x - 1 = Think of a number… Multiply it by 5 Take away 1

29 What is your answer?

30 Try another one

31 x Think of a number…

32 9x Multiply it by 9

33 9x - 7 = Think of a number… Multiply it by 9 Take away 7

34 What is your answer?

35 Try another one

36 x Think of a number…

37 X + 3 Think of a number… Add 3

38 4(x + 3) = Think of a number… Add 3 Multiply by 4

39 What is your answer?

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

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

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

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

44 Now try these: Click Here Click Here


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