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

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