Think of a Number Puzzles Worksheet

Maths tricks trick 6: Think of a number · Set 120 · 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 5 and added 9. I got 19. What was my number?
2. 2.Think of 4. Multiply it by 4, then add 5. What number do you end with?
3. 3.Think of 14. Multiply it by 4, then add 9. What number do you end with?
4. 4.Think of 14. Multiply it by 4, then add 6. What number do you end with?
5. 5.Magic trick! Think of 2. Double it, add 4, halve it, then take away 2. What number do you get?
6. 6.I thought of a number, added 8 and then doubled it. I got 32. What was my number?
7. 7.Think of 5. Multiply it by 5, then add 1. What number do you end with?
8. 8.I thought of a number, multiplied it by 4 and added 2. I got 26. What was my number?
9. 9.I thought of a number, added 2 and then doubled it. I got 38. What was my number?
10. 10.Think of 12. Multiply it by 5, then add 9. What number do you end with?
11. 11.I thought of a number, multiplied it by 5 and added 4. I got 34. What was my number?
12. 12.I thought of a number, added 7 and then doubled it. I got 36. What was my number?
13. 13.Think of 14. Multiply it by 3, then add 6. What number do you end with?
14. 14.Magic trick! Think of 4. Double it, add 14, halve it, then take away 4. What number do you get?
15. 15.I thought of a number, multiplied it by 5 and added 1. I got 16. What was my number?
16. 16.I thought of a number, added 8 and then doubled it. I got 26. What was my number?
17. 17.Magic trick! Think of 3. Double it, add 6, halve it, then take away 3. What number do you get?
18. 18.I thought of a number, added 1 and then doubled it. I got 38. What was my number?
19. 19.Magic trick! Think of 3. Double it, add 10, halve it, then take away 3. What number do you get?
20. 20.Magic trick! Think of 7. Double it, add 6, halve it, then take away 7. What number do you get?
21. 21.I thought of a number, multiplied it by 4 and added 9. I got 25. What was my number?
22. 22.I thought of a number, multiplied it by 3 and added 1. I got 31. What was my number?
23. 23.I thought of a number, multiplied it by 5 and added 2. I got 37. What was my number?
24. 24.I thought of a number, added 8 and then doubled it. I got 24. What was my number?
25. 25.Think of 10. Multiply it by 2, then add 1. What number do you end with?
26. 26.Think of 7. Multiply it by 4, then add 5. What number do you end with?
27. 27.I thought of a number, multiplied it by 3 and added 5. I got 38. What was my number?
28. 28.I thought of a number, added 1 and then doubled it. I got 26. What was my number?
29. 29.Think of 4. Multiply it by 4, then add 3. What number do you end with?
30. 30.Magic trick! Think of 16. Double it, add 6, halve it, then take away 16. What number do you get?
31. 31.I thought of a number, added 2 and then doubled it. I got 34. What was my number?
32. 32.Magic trick! Think of 19. Double it, add 8, halve it, then take away 19. What number do you get?
33. 33.I thought of a number, added 9 and then doubled it. I got 36. What was my number?
34. 34.Magic trick! Think of 5. Double it, add 6, halve it, then take away 5. What number do you get?
35. 35.I thought of a number, added 5 and then doubled it. I got 26. What was my number?
36. 36.I thought of a number, multiplied it by 3 and added 5. I got 17. What was my number?
37. 37.Magic trick! Think of 8. Double it, add 16, halve it, then take away 8. What number do you get?
38. 38.I thought of a number, multiplied it by 3 and added 2. I got 47. What was my number?
39. 39.I thought of a number, added 9 and then doubled it. I got 24. What was my number?
40. 40.I thought of a number, multiplied it by 5 and added 6. I got 81. What was my number?

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