Think of a Number Puzzles Worksheet

Maths tricks trick 6: Think of a number · Set 8 · 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, added 6 and then doubled it. I got 18. What was my number?
2. 2.I thought of a number, added 4 and then doubled it. I got 44. What was my number?
3. 3.Magic trick! Think of 3. Double it, add 8, halve it, then take away 3. What number do you get?
4. 4.I thought of a number, multiplied it by 5 and added 6. I got 36. What was my number?
5. 5.Magic trick! Think of 5. Double it, add 8, halve it, then take away 5. What number do you get?
6. 6.I thought of a number, multiplied it by 2 and added 6. I got 36. What was my number?
7. 7.I thought of a number, multiplied it by 3 and added 2. I got 41. What was my number?
8. 8.I thought of a number, added 6 and then doubled it. I got 46. What was my number?
9. 9.I thought of a number, added 1 and then doubled it. I got 36. What was my number?
10. 10.Think of 7. Multiply it by 2, then add 6. What number do you end with?
11. 11.I thought of a number, added 8 and then doubled it. I got 30. What was my number?
12. 12.I thought of a number, multiplied it by 2 and added 2. I got 10. What was my number?
13. 13.Think of 10. Multiply it by 2, then add 9. What number do you end with?
14. 14.I thought of a number, multiplied it by 5 and added 3. I got 63. What was my number?
15. 15.Magic trick! Think of 16. Double it, add 6, halve it, then take away 16. What number do you get?
16. 16.I thought of a number, added 5 and then doubled it. I got 50. What was my number?
17. 17.I thought of a number, added 7 and then doubled it. I got 34. What was my number?
18. 18.Think of 6. Multiply it by 2, then add 3. What number do you end with?
19. 19.I thought of a number, multiplied it by 5 and added 1. I got 31. What was my number?
20. 20.I thought of a number, multiplied it by 2 and added 9. I got 37. What was my number?
21. 21.Think of 14. Multiply it by 5, then add 2. What number do you end with?
22. 22.I thought of a number, multiplied it by 2 and added 5. I got 21. What was my number?
23. 23.I thought of a number, added 3 and then doubled it. I got 22. What was my number?
24. 24.I thought of a number, multiplied it by 5 and added 2. I got 67. What was my number?
25. 25.I thought of a number, multiplied it by 2 and added 2. I got 32. What was my number?
26. 26.Magic trick! Think of 4. Double it, add 10, halve it, then take away 4. What number do you get?
27. 27.Think of 2. Multiply it by 4, then add 7. What number do you end with?
28. 28.I thought of a number, multiplied it by 5 and added 6. I got 71. What was my number?
29. 29.Magic trick! Think of 13. Double it, add 4, halve it, then take away 13. What number do you get?
30. 30.Magic trick! Think of 17. Double it, add 14, halve it, then take away 17. What number do you get?
31. 31.I thought of a number, multiplied it by 4 and added 5. I got 25. What was my number?
32. 32.I thought of a number, multiplied it by 4 and added 3. I got 31. What was my number?
33. 33.I thought of a number, added 5 and then doubled it. I got 20. What was my number?
34. 34.Think of 6. Multiply it by 2, then add 2. What number do you end with?
35. 35.I thought of a number, added 2 and then doubled it. I got 32. What was my number?
36. 36.I thought of a number, multiplied it by 5 and added 4. I got 54. What was my number?
37. 37.Think of 2. Multiply it by 4, then add 2. What number do you end with?
38. 38.Think of 9. Multiply it by 4, then add 2. What number do you end with?
39. 39.Think of 4. Multiply it by 3, then add 1. What number do you end with?
40. 40.I thought of a number, multiplied it by 5 and added 3. I got 68. What was my number?

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