Think of a Number Puzzles Worksheet

Maths tricks trick 6: Think of a number · Set 76 · 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 15. Double it, add 16, halve it, then take away 15. What number do you get?
2. 2.Think of 14. Multiply it by 4, then add 7. What number do you end with?
3. 3.Think of 9. Multiply it by 4, then add 4. What number do you end with?
4. 4.Think of 5. Multiply it by 5, then add 1. What number do you end with?
5. 5.Magic trick! Think of 4. Double it, add 4, halve it, then take away 4. What number do you get?
6. 6.I thought of a number, multiplied it by 3 and added 3. I got 21. What was my number?
7. 7.Magic trick! Think of 4. Double it, add 8, halve it, then take away 4. What number do you get?
8. 8.Magic trick! Think of 5. Double it, add 14, halve it, then take away 5. What number do you get?
9. 9.I thought of a number, multiplied it by 2 and added 5. I got 15. What was my number?
10. 10.I thought of a number, multiplied it by 4 and added 8. I got 48. What was my number?
11. 11.Magic trick! Think of 11. Double it, add 4, halve it, then take away 11. What number do you get?
12. 12.Magic trick! Think of 3. Double it, add 18, halve it, then take away 3. What number do you get?
13. 13.Magic trick! Think of 15. Double it, add 10, halve it, then take away 15. What number do you get?
14. 14.I thought of a number, multiplied it by 4 and added 1. I got 21. What was my number?
15. 15.Think of 11. Multiply it by 5, then add 4. What number do you end with?
16. 16.Think of 7. Multiply it by 2, then add 1. What number do you end with?
17. 17.Think of 8. Multiply it by 4, then add 2. What number do you end with?
18. 18.Think of 15. Multiply it by 4, then add 4. What number do you end with?
19. 19.I thought of a number, multiplied it by 4 and added 7. I got 19. What was my number?
20. 20.I thought of a number, added 4 and then doubled it. I got 18. What was my number?
21. 21.I thought of a number, multiplied it by 4 and added 1. I got 49. What was my number?
22. 22.I thought of a number, multiplied it by 2 and added 4. I got 26. What was my number?
23. 23.I thought of a number, multiplied it by 3 and added 5. I got 17. What was my number?
24. 24.Magic trick! Think of 10. Double it, add 16, halve it, then take away 10. What number do you get?
25. 25.Magic trick! Think of 13. Double it, add 14, halve it, then take away 13. What number do you get?
26. 26.Think of 15. Multiply it by 3, then add 8. What number do you end with?
27. 27.Magic trick! Think of 15. Double it, add 4, halve it, then take away 15. What number do you get?
28. 28.I thought of a number, added 8 and then doubled it. I got 48. What was my number?
29. 29.I thought of a number, multiplied it by 5 and added 9. I got 49. What was my number?
30. 30.I thought of a number, added 8 and then doubled it. I got 46. What was my number?
31. 31.I thought of a number, added 8 and then doubled it. I got 32. What was my number?
32. 32.I thought of a number, added 1 and then doubled it. I got 40. What was my number?
33. 33.Magic trick! Think of 5. Double it, add 8, halve it, then take away 5. What number do you get?
34. 34.I thought of a number, multiplied it by 2 and added 3. I got 25. What was my number?
35. 35.I thought of a number, multiplied it by 2 and added 7. I got 11. What was my number?
36. 36.I thought of a number, multiplied it by 2 and added 3. I got 9. What was my number?
37. 37.Magic trick! Think of 11. Double it, add 16, halve it, then take away 11. What number do you get?
38. 38.Think of 4. Multiply it by 3, then add 4. What number do you end with?
39. 39.I thought of a number, multiplied it by 5 and added 6. I got 71. What was my number?
40. 40.Magic trick! Think of 4. Double it, add 12, halve it, then take away 4. What number do you get?

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