Think of a Number Puzzles Worksheet

Maths tricks trick 6: Think of a number · Set 5 · 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 8, halve it, then take away 6. What number do you get?
2. 2.I thought of a number, added 5 and then doubled it. I got 32. What was my number?
3. 3.Think of 2. Multiply it by 4, then add 9. What number do you end with?
4. 4.Magic trick! Think of 2. Double it, add 10, halve it, then take away 2. What number do you get?
5. 5.I thought of a number, multiplied it by 3 and added 7. I got 28. What was my number?
6. 6.I thought of a number, added 5 and then doubled it. I got 26. What was my number?
7. 7.I thought of a number, added 3 and then doubled it. I got 30. What was my number?
8. 8.I thought of a number, multiplied it by 2 and added 2. I got 22. What was my number?
9. 9.Think of 8. Multiply it by 5, then add 5. What number do you end with?
10. 10.I thought of a number, multiplied it by 5 and added 3. I got 28. What was my number?
11. 11.Magic trick! Think of 2. Double it, add 4, halve it, then take away 2. What number do you get?
12. 12.Think of 9. Multiply it by 5, then add 5. What number do you end with?
13. 13.I thought of a number, added 5 and then doubled it. I got 20. What was my number?
14. 14.Think of 11. Multiply it by 2, then add 4. What number do you end with?
15. 15.Think of 13. Multiply it by 2, then add 3. What number do you end with?
16. 16.I thought of a number, multiplied it by 5 and added 4. I got 44. What was my number?
17. 17.Think of 8. Multiply it by 2, then add 2. What number do you end with?
18. 18.Magic trick! Think of 10. Double it, add 12, halve it, then take away 10. What number do you get?
19. 19.Think of 2. Multiply it by 3, then add 6. What number do you end with?
20. 20.Magic trick! Think of 4. Double it, add 16, halve it, then take away 4. What number do you get?
21. 21.I thought of a number, multiplied it by 5 and added 7. I got 72. What was my number?
22. 22.I thought of a number, multiplied it by 4 and added 1. I got 9. What was my number?
23. 23.Think of 5. Multiply it by 5, then add 9. What number do you end with?
24. 24.Magic trick! Think of 3. Double it, add 12, halve it, then take away 3. What number do you get?
25. 25.I thought of a number, added 5 and then doubled it. I got 24. What was my number?
26. 26.I thought of a number, multiplied it by 3 and added 5. I got 50. What was my number?
27. 27.I thought of a number, multiplied it by 4 and added 3. I got 63. What was my number?
28. 28.I thought of a number, multiplied it by 2 and added 1. I got 7. What was my number?
29. 29.Magic trick! Think of 16. Double it, add 6, halve it, then take away 16. What number do you get?
30. 30.Think of 4. Multiply it by 2, then add 7. What number do you end with?
31. 31.I thought of a number, added 8 and then doubled it. I got 24. What was my number?
32. 32.I thought of a number, multiplied it by 5 and added 2. I got 67. What was my number?
33. 33.Think of 15. Multiply it by 5, then add 3. What number do you end with?
34. 34.Magic trick! Think of 2. Double it, add 6, halve it, then take away 2. What number do you get?
35. 35.I thought of a number, added 7 and then doubled it. I got 28. What was my number?
36. 36.I thought of a number, added 1 and then doubled it. I got 10. What was my number?
37. 37.Think of 13. Multiply it by 4, then add 8. What number do you end with?
38. 38.I thought of a number, added 7 and then doubled it. I got 54. What was my number?
39. 39.Magic trick! Think of 5. Double it, add 12, halve it, then take away 5. What number do you get?
40. 40.Magic trick! Think of 4. Double it, add 18, halve it, then take away 4. What number do you get?

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