Think of a Number Puzzles Worksheet

Maths tricks trick 6: Think of a number · Set 132 · 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.Magic trick! Think of 6. Double it, add 18, halve it, then take away 6. What number do you get?
2. 2.I thought of a number, multiplied it by 3 and added 7. I got 46. What was my number?
3. 3.I thought of a number, multiplied it by 4 and added 1. I got 25. What was my number?
4. 4.I thought of a number, multiplied it by 5 and added 5. I got 65. What was my number?
5. 5.Magic trick! Think of 12. Double it, add 6, halve it, then take away 12. What number do you get?
6. 6.I thought of a number, added 2 and then doubled it. I got 28. What was my number?
7. 7.Think of 3. Multiply it by 4, then add 3. What number do you end with?
8. 8.I thought of a number, added 8 and then doubled it. I got 40. What was my number?
9. 9.Magic trick! Think of 2. Double it, add 18, halve it, then take away 2. What number do you get?
10. 10.Magic trick! Think of 11. Double it, add 4, halve it, then take away 11. What number do you get?
11. 11.I thought of a number, multiplied it by 5 and added 6. I got 31. What was my number?
12. 12.I thought of a number, multiplied it by 4 and added 7. I got 55. What was my number?
13. 13.I thought of a number, multiplied it by 5 and added 8. I got 78. What was my number?
14. 14.I thought of a number, multiplied it by 2 and added 6. I got 26. What was my number?
15. 15.I thought of a number, added 2 and then doubled it. I got 40. What was my number?
16. 16.I thought of a number, multiplied it by 3 and added 5. I got 14. What was my number?
17. 17.Magic trick! Think of 6. Double it, add 16, halve it, then take away 6. What number do you get?
18. 18.I thought of a number, added 1 and then doubled it. I got 12. What was my number?
19. 19.Magic trick! Think of 7. Double it, add 14, halve it, then take away 7. What number do you get?
20. 20.I thought of a number, added 6 and then doubled it. I got 42. What was my number?
21. 21.I thought of a number, multiplied it by 5 and added 1. I got 11. What was my number?
22. 22.I thought of a number, multiplied it by 5 and added 1. I got 56. What was my number?
23. 23.Think of 4. Multiply it by 4, then add 9. What number do you end with?
24. 24.Think of 5. Multiply it by 2, then add 3. What number do you end with?
25. 25.I thought of a number, added 1 and then doubled it. I got 22. What was my number?
26. 26.Magic trick! Think of 5. Double it, add 6, halve it, then take away 5. What number do you get?
27. 27.I thought of a number, multiplied it by 2 and added 6. I got 10. What was my number?
28. 28.Magic trick! Think of 12. Double it, add 12, halve it, then take away 12. What number do you get?
29. 29.Magic trick! Think of 11. Double it, add 12, halve it, then take away 11. What number do you get?
30. 30.Magic trick! Think of 10. Double it, add 4, halve it, then take away 10. What number do you get?
31. 31.I thought of a number, added 1 and then doubled it. I got 42. What was my number?
32. 32.I thought of a number, added 1 and then doubled it. I got 34. What was my number?
33. 33.I thought of a number, multiplied it by 3 and added 9. I got 42. What was my number?
34. 34.Magic trick! Think of 19. Double it, add 14, halve it, then take away 19. What number do you get?
35. 35.I thought of a number, multiplied it by 3 and added 4. I got 28. What was my number?
36. 36.Magic trick! Think of 17. Double it, add 10, halve it, then take away 17. What number do you get?
37. 37.Magic trick! Think of 13. Double it, add 12, halve it, then take away 13. What number do you get?
38. 38.Think of 5. Multiply it by 2, then add 7. What number do you end with?
39. 39.Think of 9. Multiply it by 3, then add 5. What number do you end with?
40. 40.Think of 13. Multiply it by 4, then add 8. What number do you end with?

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