Think of a Number Puzzles Worksheet

Maths tricks trick 6: Think of a number · Set 196 · 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 8. Double it, add 6, halve it, then take away 8. What number do you get?
2. 2.Think of 8. Multiply it by 4, then add 2. What number do you end with?
3. 3.I thought of a number, added 9 and then doubled it. I got 26. What was my number?
4. 4.I thought of a number, multiplied it by 5 and added 9. I got 69. What was my number?
5. 5.I thought of a number, multiplied it by 2 and added 4. I got 28. What was my number?
6. 6.I thought of a number, added 4 and then doubled it. I got 30. What was my number?
7. 7.I thought of a number, added 1 and then doubled it. I got 18. What was my number?
8. 8.Think of 5. Multiply it by 2, then add 5. What number do you end with?
9. 9.I thought of a number, multiplied it by 4 and added 9. I got 21. What was my number?
10. 10.I thought of a number, multiplied it by 4 and added 2. I got 38. What was my number?
11. 11.I thought of a number, added 6 and then doubled it. I got 48. What was my number?
12. 12.Think of 12. Multiply it by 2, then add 1. What number do you end with?
13. 13.I thought of a number, added 7 and then doubled it. I got 20. What was my number?
14. 14.Think of 14. Multiply it by 4, then add 6. What number do you end with?
15. 15.Think of 15. Multiply it by 5, then add 7. What number do you end with?
16. 16.Magic trick! Think of 3. Double it, add 18, halve it, then take away 3. What number do you get?
17. 17.Think of 4. Multiply it by 2, then add 6. What number do you end with?
18. 18.I thought of a number, multiplied it by 3 and added 2. I got 29. What was my number?
19. 19.I thought of a number, multiplied it by 3 and added 6. I got 42. What was my number?
20. 20.Think of 7. Multiply it by 5, then add 1. What number do you end with?
21. 21.Think of 10. Multiply it by 4, then add 5. What number do you end with?
22. 22.I thought of a number, multiplied it by 3 and added 3. I got 9. What was my number?
23. 23.Magic trick! Think of 7. Double it, add 18, halve it, then take away 7. What number do you get?
24. 24.I thought of a number, multiplied it by 4 and added 1. I got 13. What was my number?
25. 25.Think of 4. Multiply it by 4, then add 9. What number do you end with?
26. 26.I thought of a number, multiplied it by 2 and added 4. I got 14. What was my number?
27. 27.Magic trick! Think of 20. Double it, add 18, halve it, then take away 20. What number do you get?
28. 28.I thought of a number, added 8 and then doubled it. I got 52. What was my number?
29. 29.Magic trick! Think of 15. Double it, add 14, halve it, then take away 15. What number do you get?
30. 30.I thought of a number, added 3 and then doubled it. I got 46. What was my number?
31. 31.Magic trick! Think of 14. Double it, add 4, halve it, then take away 14. What number do you get?
32. 32.Think of 4. Multiply it by 2, then add 3. What number do you end with?
33. 33.Magic trick! Think of 7. Double it, add 8, halve it, then take away 7. What number do you get?
34. 34.I thought of a number, multiplied it by 4 and added 3. I got 63. What was my number?
35. 35.I thought of a number, added 3 and then doubled it. I got 26. What was my number?
36. 36.I thought of a number, added 2 and then doubled it. I got 44. What was my number?
37. 37.Think of 5. Multiply it by 2, then add 2. What number do you end with?
38. 38.Think of 11. Multiply it by 4, then add 4. What number do you end with?
39. 39.Think of 6. Multiply it by 5, then add 6. What number do you end with?
40. 40.I thought of a number, multiplied it by 3 and added 5. I got 50. What was my number?

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