Think of a Number Puzzles Worksheet

Maths tricks trick 6: Think of a number · Set 168 · 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 4 and added 7. I got 63. What was my number?
2. 2.I thought of a number, multiplied it by 2 and added 5. I got 31. What was my number?
3. 3.I thought of a number, added 2 and then doubled it. I got 24. What was my number?
4. 4.Magic trick! Think of 11. Double it, add 14, halve it, then take away 11. What number do you get?
5. 5.I thought of a number, added 5 and then doubled it. I got 34. What was my number?
6. 6.Think of 13. Multiply it by 5, then add 6. What number do you end with?
7. 7.I thought of a number, added 5 and then doubled it. I got 30. What was my number?
8. 8.I thought of a number, added 7 and then doubled it. I got 30. What was my number?
9. 9.I thought of a number, multiplied it by 2 and added 6. I got 28. What was my number?
10. 10.Think of 6. Multiply it by 2, then add 1. What number do you end with?
11. 11.I thought of a number, multiplied it by 2 and added 3. I got 19. What was my number?
12. 12.I thought of a number, added 9 and then doubled it. I got 58. What was my number?
13. 13.I thought of a number, multiplied it by 5 and added 8. I got 28. What was my number?
14. 14.Think of 4. Multiply it by 4, then add 6. What number do you end with?
15. 15.Think of 9. Multiply it by 5, then add 8. What number do you end with?
16. 16.Think of 3. Multiply it by 4, then add 2. What number do you end with?
17. 17.Magic trick! Think of 4. Double it, add 6, halve it, then take away 4. What number do you get?
18. 18.Think of 10. Multiply it by 5, then add 2. What number do you end with?
19. 19.I thought of a number, multiplied it by 2 and added 5. I got 29. What was my number?
20. 20.I thought of a number, multiplied it by 3 and added 5. I got 44. What was my number?
21. 21.I thought of a number, added 1 and then doubled it. I got 12. What was my number?
22. 22.I thought of a number, multiplied it by 4 and added 7. I got 67. What was my number?
23. 23.I thought of a number, added 8 and then doubled it. I got 54. What was my number?
24. 24.Magic trick! Think of 2. Double it, add 18, halve it, then take away 2. What number do you get?
25. 25.I thought of a number, added 8 and then doubled it. I got 30. What was my number?
26. 26.I thought of a number, multiplied it by 2 and added 4. I got 18. What was my number?
27. 27.I thought of a number, added 4 and then doubled it. I got 38. What was my number?
28. 28.Magic trick! Think of 5. Double it, add 12, halve it, then take away 5. What number do you get?
29. 29.I thought of a number, added 2 and then doubled it. I got 32. What was my number?
30. 30.I thought of a number, multiplied it by 3 and added 2. I got 38. What was my number?
31. 31.I thought of a number, added 2 and then doubled it. I got 12. What was my number?
32. 32.I thought of a number, multiplied it by 3 and added 5. I got 32. What was my number?
33. 33.Think of 4. Multiply it by 4, then add 2. What number do you end with?
34. 34.I thought of a number, added 6 and then doubled it. I got 28. What was my number?
35. 35.I thought of a number, added 6 and then doubled it. I got 26. What was my number?
36. 36.Think of 2. Multiply it by 5, then add 8. What number do you end with?
37. 37.Magic trick! Think of 8. Double it, add 14, halve it, then take away 8. What number do you get?
38. 38.Magic trick! Think of 2. Double it, add 14, halve it, then take away 2. What number do you get?
39. 39.I thought of a number, multiplied it by 5 and added 9. I got 34. What was my number?
40. 40.Magic trick! Think of 15. Double it, add 6, halve it, then take away 15. What number do you get?

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