Think of a Number Puzzles Worksheet

Maths tricks trick 6: Think of a number · Set 68 · 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.Think of 3. Multiply it by 2, then add 8. What number do you end with?
2. 2.I thought of a number, multiplied it by 4 and added 5. I got 13. What was my number?
3. 3.I thought of a number, multiplied it by 3 and added 3. I got 18. What was my number?
4. 4.Think of 4. Multiply it by 3, then add 7. What number do you end with?
5. 5.I thought of a number, multiplied it by 5 and added 3. I got 68. What was my number?
6. 6.I thought of a number, multiplied it by 3 and added 7. I got 25. What was my number?
7. 7.Think of 15. Multiply it by 4, then add 2. What number do you end with?
8. 8.Think of 10. Multiply it by 2, then add 5. What number do you end with?
9. 9.I thought of a number, added 6 and then doubled it. I got 36. What was my number?
10. 10.Think of 12. Multiply it by 2, then add 1. What number do you end with?
11. 11.Think of 13. Multiply it by 4, then add 4. What number do you end with?
12. 12.I thought of a number, multiplied it by 4 and added 1. I got 13. What was my number?
13. 13.I thought of a number, multiplied it by 2 and added 3. I got 33. What was my number?
14. 14.I thought of a number, multiplied it by 4 and added 8. I got 52. What was my number?
15. 15.I thought of a number, multiplied it by 2 and added 1. I got 21. What was my number?
16. 16.Magic trick! Think of 4. Double it, add 8, halve it, then take away 4. What number do you get?
17. 17.I thought of a number, added 3 and then doubled it. I got 24. What was my number?
18. 18.Think of 2. Multiply it by 4, then add 8. What number do you end with?
19. 19.Think of 11. Multiply it by 2, then add 5. What number do you end with?
20. 20.I thought of a number, added 7 and then doubled it. I got 20. What was my number?
21. 21.Think of 9. Multiply it by 3, then add 7. What number do you end with?
22. 22.I thought of a number, added 3 and then doubled it. I got 28. What was my number?
23. 23.Think of 7. Multiply it by 3, then add 4. What number do you end with?
24. 24.I thought of a number, multiplied it by 5 and added 9. I got 24. What was my number?
25. 25.I thought of a number, added 1 and then doubled it. I got 12. What was my number?
26. 26.I thought of a number, multiplied it by 4 and added 2. I got 10. What was my number?
27. 27.I thought of a number, added 1 and then doubled it. I got 30. What was my number?
28. 28.Magic trick! Think of 5. Double it, add 14, halve it, then take away 5. What number do you get?
29. 29.I thought of a number, added 2 and then doubled it. I got 32. What was my number?
30. 30.I thought of a number, added 7 and then doubled it. I got 38. What was my number?
31. 31.I thought of a number, multiplied it by 4 and added 6. I got 30. What was my number?
32. 32.Think of 12. Multiply it by 2, then add 8. What number do you end with?
33. 33.I thought of a number, multiplied it by 4 and added 1. I got 53. What was my number?
34. 34.I thought of a number, multiplied it by 3 and added 2. I got 20. What was my number?
35. 35.I thought of a number, added 3 and then doubled it. I got 18. What was my number?
36. 36.I thought of a number, multiplied it by 3 and added 5. I got 44. What was my number?
37. 37.Think of 6. Multiply it by 4, then add 7. What number do you end with?
38. 38.I thought of a number, added 3 and then doubled it. I got 14. What was my number?
39. 39.Think of 15. Multiply it by 5, then add 1. What number do you end with?
40. 40.Magic trick! Think of 20. Double it, add 8, halve it, then take away 20. What number do you get?

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