Think of a Number Puzzles Worksheet

Maths tricks trick 6: Think of a number · Set 144 · 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 2 and added 3. I got 13. What was my number?
2. 2.Think of 4. Multiply it by 4, then add 5. What number do you end with?
3. 3.I thought of a number, multiplied it by 5 and added 9. I got 39. What was my number?
4. 4.I thought of a number, multiplied it by 4 and added 1. I got 9. What was my number?
5. 5.I thought of a number, added 6 and then doubled it. I got 48. What was my number?
6. 6.Magic trick! Think of 7. Double it, add 8, halve it, then take away 7. What number do you get?
7. 7.I thought of a number, multiplied it by 4 and added 6. I got 58. What was my number?
8. 8.Think of 4. Multiply it by 5, then add 5. What number do you end with?
9. 9.Magic trick! Think of 13. Double it, add 10, halve it, then take away 13. What number do you get?
10. 10.I thought of a number, multiplied it by 4 and added 6. I got 54. What was my number?
11. 11.I thought of a number, multiplied it by 4 and added 5. I got 49. What was my number?
12. 12.Think of 4. Multiply it by 5, then add 7. What number do you end with?
13. 13.I thought of a number, added 3 and then doubled it. I got 22. What was my number?
14. 14.I thought of a number, added 9 and then doubled it. I got 50. What was my number?
15. 15.I thought of a number, added 3 and then doubled it. I got 12. What was my number?
16. 16.I thought of a number, added 5 and then doubled it. I got 42. 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.I thought of a number, added 4 and then doubled it. I got 46. What was my number?
19. 19.Think of 15. Multiply it by 4, then add 6. What number do you end with?
20. 20.Think of 9. Multiply it by 5, then add 9. What number do you end with?
21. 21.Magic trick! Think of 16. Double it, add 18, halve it, then take away 16. What number do you get?
22. 22.Magic trick! Think of 7. Double it, add 6, halve it, then take away 7. What number do you get?
23. 23.I thought of a number, added 8 and then doubled it. I got 46. What was my number?
24. 24.I thought of a number, multiplied it by 3 and added 3. I got 9. What was my number?
25. 25.Magic trick! Think of 12. Double it, add 8, halve it, then take away 12. What number do you get?
26. 26.Think of 2. Multiply it by 2, then add 2. What number do you end with?
27. 27.Magic trick! Think of 10. Double it, add 8, halve it, then take away 10. What number do you get?
28. 28.I thought of a number, multiplied it by 5 and added 7. I got 82. What was my number?
29. 29.I thought of a number, multiplied it by 3 and added 7. I got 52. What was my number?
30. 30.Magic trick! Think of 5. Double it, add 8, halve it, then take away 5. What number do you get?
31. 31.I thought of a number, added 9 and then doubled it. I got 28. What was my number?
32. 32.I thought of a number, multiplied it by 5 and added 3. I got 43. What was my number?
33. 33.Magic trick! Think of 10. Double it, add 12, halve it, then take away 10. What number do you get?
34. 34.Magic trick! Think of 15. Double it, add 12, halve it, then take away 15. What number do you get?
35. 35.Think of 5. Multiply it by 2, then add 4. What number do you end with?
36. 36.I thought of a number, added 7 and then doubled it. I got 54. What was my number?
37. 37.I thought of a number, multiplied it by 5 and added 6. I got 56. What was my number?
38. 38.I thought of a number, multiplied it by 4 and added 4. I got 64. What was my number?
39. 39.I thought of a number, added 7 and then doubled it. I got 28. What was my number?
40. 40.Think of 15. Multiply it by 5, then add 4. What number do you end with?

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