Think of a Number Puzzles Worksheet

Maths tricks trick 6: Think of a number · Set 19 · 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 9. Double it, add 18, halve it, then take away 9. What number do you get?
2. 2.I thought of a number, multiplied it by 5 and added 1. I got 36. What was my number?
3. 3.I thought of a number, added 5 and then doubled it. I got 20. What was my number?
4. 4.I thought of a number, multiplied it by 2 and added 3. I got 25. What was my number?
5. 5.I thought of a number, multiplied it by 3 and added 1. I got 19. What was my number?
6. 6.I thought of a number, added 4 and then doubled it. I got 44. What was my number?
7. 7.I thought of a number, added 4 and then doubled it. I got 38. What was my number?
8. 8.I thought of a number, multiplied it by 4 and added 8. I got 24. What was my number?
9. 9.Think of 5. Multiply it by 2, then add 2. What number do you end with?
10. 10.Magic trick! Think of 20. Double it, add 12, halve it, then take away 20. What number do you get?
11. 11.I thought of a number, added 6 and then doubled it. I got 30. What was my number?
12. 12.I thought of a number, added 9 and then doubled it. I got 46. What was my number?
13. 13.I thought of a number, added 7 and then doubled it. I got 26. What was my number?
14. 14.I thought of a number, added 7 and then doubled it. I got 34. What was my number?
15. 15.Think of 11. Multiply it by 2, then add 2. What number do you end with?
16. 16.Magic trick! Think of 6. Double it, add 12, halve it, then take away 6. What number do you get?
17. 17.Magic trick! Think of 15. Double it, add 10, halve it, then take away 15. What number do you get?
18. 18.Magic trick! Think of 16. Double it, add 16, halve it, then take away 16. What number do you get?
19. 19.Magic trick! Think of 2. Double it, add 16, halve it, then take away 2. What number do you get?
20. 20.I thought of a number, added 1 and then doubled it. I got 40. What was my number?
21. 21.I thought of a number, multiplied it by 5 and added 3. I got 73. What was my number?
22. 22.I thought of a number, multiplied it by 5 and added 9. I got 84. What was my number?
23. 23.I thought of a number, multiplied it by 4 and added 4. I got 24. What was my number?
24. 24.I thought of a number, multiplied it by 2 and added 3. I got 17. What was my number?
25. 25.Think of 9. Multiply it by 5, then add 8. What number do you end with?
26. 26.Think of 4. Multiply it by 4, then add 8. What number do you end with?
27. 27.I thought of a number, multiplied it by 5 and added 7. I got 42. What was my number?
28. 28.I thought of a number, added 1 and then doubled it. I got 38. What was my number?
29. 29.Magic trick! Think of 8. Double it, add 8, halve it, then take away 8. What number do you get?
30. 30.Magic trick! Think of 6. Double it, add 14, halve it, then take away 6. What number do you get?
31. 31.I thought of a number, multiplied it by 3 and added 8. I got 47. What was my number?
32. 32.Magic trick! Think of 16. Double it, add 10, halve it, then take away 16. What number do you get?
33. 33.Magic trick! Think of 15. Double it, add 14, halve it, then take away 15. What number do you get?
34. 34.I thought of a number, added 4 and then doubled it. I got 18. What was my number?
35. 35.I thought of a number, added 4 and then doubled it. I got 48. What was my number?
36. 36.Think of 5. Multiply it by 4, then add 1. What number do you end with?
37. 37.Think of 4. Multiply it by 5, then add 5. What number do you end with?
38. 38.I thought of a number, multiplied it by 5 and added 6. I got 41. What was my number?
39. 39.I thought of a number, added 4 and then doubled it. I got 20. What was my number?
40. 40.Magic trick! Think of 17. Double it, add 16, halve it, then take away 17. What number do you get?

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