Think of a Number Puzzles Worksheet

Maths tricks trick 6: Think of a number · Set 108 · 40 questions

The trick (Undo the steps): Going forwards: do the steps in order. Going backwards: start from the result and undo each step, last one first. Undo + with −, × with ÷, and doubling with halving.

1. 1.I thought of a number, multiplied it by 4 and added 9. I got 69. What was my number?
2. 2.Think of 9. Multiply it by 3, then add 5. What number do you end with?
3. 3.I thought of a number, multiplied it by 3 and added 8. I got 47. What was my number?
4. 4.Magic trick! Think of 8. Double it, add 16, halve it, then take away 8. What number do you get?
5. 5.I thought of a number, multiplied it by 3 and added 1. I got 19. What was my number?
6. 6.Magic trick! Think of 6. Double it, add 12, halve it, then take away 6. What number do you get?
7. 7.Magic trick! Think of 14. Double it, add 16, halve it, then take away 14. What number do you get?
8. 8.I thought of a number, multiplied it by 2 and added 9. I got 13. What was my number?
9. 9.Magic trick! Think of 11. Double it, add 16, halve it, then take away 11. What number do you get?
10. 10.Magic trick! Think of 18. Double it, add 6, halve it, then take away 18. What number do you get?
11. 11.I thought of a number, added 1 and then doubled it. I got 10. What was my number?
12. 12.Magic trick! Think of 12. Double it, add 4, halve it, then take away 12. What number do you get?
13. 13.I thought of a number, added 3 and then doubled it. I got 12. What was my number?
14. 14.I thought of a number, added 2 and then doubled it. I got 30. What was my number?
15. 15.I thought of a number, added 8 and then doubled it. I got 46. What was my number?
16. 16.Think of 15. Multiply it by 2, then add 8. What number do you end with?
17. 17.I thought of a number, added 6 and then doubled it. I got 18. What was my number?
18. 18.I thought of a number, added 7 and then doubled it. I got 50. What was my number?
19. 19.Magic trick! Think of 8. Double it, add 12, halve it, then take away 8. What number do you get?
20. 20.Think of 2. Multiply it by 2, then add 9. What number do you end with?
21. 21.Think of 13. Multiply it by 5, then add 2. What number do you end with?
22. 22.I thought of a number, multiplied it by 3 and added 1. I got 16. What was my number?
23. 23.I thought of a number, added 8 and then doubled it. I got 40. What was my number?
24. 24.Think of 9. Multiply it by 2, then add 2. What number do you end with?
25. 25.Think of 12. Multiply it by 4, then add 8. What number do you end with?
26. 26.I thought of a number, added 5 and then doubled it. I got 38. What was my number?
27. 27.Think of 6. Multiply it by 5, then add 4. What number do you end with?
28. 28.I thought of a number, added 7 and then doubled it. I got 52. What was my number?
29. 29.Think of 3. Multiply it by 3, then add 9. What number do you end with?
30. 30.I thought of a number, multiplied it by 5 and added 1. I got 61. What was my number?
31. 31.Think of 14. Multiply it by 4, then add 9. What number do you end with?
32. 32.I thought of a number, added 2 and then doubled it. I got 14. What was my number?
33. 33.I thought of a number, added 3 and then doubled it. I got 28. What was my number?
34. 34.Magic trick! Think of 15. Double it, add 10, halve it, then take away 15. What number do you get?
35. 35.I thought of a number, added 6 and then doubled it. I got 26. What was my number?
36. 36.I thought of a number, added 5 and then doubled it. I got 28. What was my number?
37. 37.I thought of a number, added 8 and then doubled it. I got 42. What was my number?
38. 38.Think of 6. Multiply it by 2, then add 9. What number do you end with?
39. 39.I thought of a number, added 6 and then doubled it. I got 22. What was my number?
40. 40.Think of 9. Multiply it by 2, then add 8. What number do you end with?

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