Think of a Number Puzzles Worksheet

Maths tricks trick 6: Think of a number · Set 180 · 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 14, halve it, then take away 6. What number do you get?
2. 2.I thought of a number, added 2 and then doubled it. I got 24. What was my number?
3. 3.Think of 3. Multiply it by 5, then add 1. What number do you end with?
4. 4.I thought of a number, added 7 and then doubled it. I got 32. What was my number?
5. 5.Magic trick! Think of 14. Double it, add 4, halve it, then take away 14. What number do you get?
6. 6.I thought of a number, added 3 and then doubled it. I got 26. What was my number?
7. 7.Magic trick! Think of 3. Double it, add 4, halve it, then take away 3. What number do you get?
8. 8.Think of 10. Multiply it by 5, then add 5. What number do you end with?
9. 9.I thought of a number, multiplied it by 2 and added 5. I got 33. What was my number?
10. 10.Think of 14. Multiply it by 4, then add 4. What number do you end with?
11. 11.I thought of a number, multiplied it by 2 and added 2. I got 24. What was my number?
12. 12.I thought of a number, added 1 and then doubled it. I got 16. What was my number?
13. 13.Magic trick! Think of 19. Double it, add 10, halve it, then take away 19. What number do you get?
14. 14.I thought of a number, multiplied it by 5 and added 7. I got 57. What was my number?
15. 15.I thought of a number, added 1 and then doubled it. I got 36. What was my number?
16. 16.Think of 14. Multiply it by 3, then add 7. What number do you end with?
17. 17.Think of 8. Multiply it by 2, then add 7. What number do you end with?
18. 18.I thought of a number, added 4 and then doubled it. I got 20. What was my number?
19. 19.Magic trick! Think of 8. Double it, add 18, halve it, then take away 8. What number do you get?
20. 20.I thought of a number, multiplied it by 2 and added 2. I got 26. What was my number?
21. 21.I thought of a number, added 4 and then doubled it. I got 32. What was my number?
22. 22.Magic trick! Think of 2. Double it, add 4, halve it, then take away 2. What number do you get?
23. 23.I thought of a number, multiplied it by 5 and added 7. I got 47. What was my number?
24. 24.Magic trick! Think of 15. Double it, add 10, halve it, then take away 15. What number do you get?
25. 25.I thought of a number, multiplied it by 4 and added 8. I got 48. What was my number?
26. 26.I thought of a number, added 3 and then doubled it. I got 12. What was my number?
27. 27.Think of 14. Multiply it by 2, then add 4. What number do you end with?
28. 28.Think of 13. Multiply it by 5, then add 8. What number do you end with?
29. 29.I thought of a number, multiplied it by 2 and added 1. I got 23. What was my number?
30. 30.I thought of a number, multiplied it by 3 and added 1. I got 22. What was my number?
31. 31.Think of 3. Multiply it by 5, then add 5. What number do you end with?
32. 32.I thought of a number, added 9 and then doubled it. I got 58. What was my number?
33. 33.I thought of a number, added 2 and then doubled it. I got 32. What was my number?
34. 34.Think of 2. Multiply it by 2, then add 3. What number do you end with?
35. 35.I thought of a number, added 9 and then doubled it. I got 30. What was my number?
36. 36.I thought of a number, added 7 and then doubled it. I got 42. What was my number?
37. 37.I thought of a number, added 4 and then doubled it. I got 28. What was my number?
38. 38.I thought of a number, added 8 and then doubled it. I got 34. What was my number?
39. 39.Think of 3. Multiply it by 5, then add 7. What number do you end with?
40. 40.Think of 5. Multiply it by 4, then add 3. What number do you end with?

Free maths tricks lessons, practice and worksheets at talentjr.in/maths-tricks