Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 647 · 40 questions

The trick (Choose a trick): × 9 → finger trick; × 4 → double double; × 10, 100, 1000 → slide and add zeros. 37, 12345679 or 111… → magic patterns; reverse and subtract → 1089. Puzzles: find the rule, the total or the leftover days, then check your answer.

1. 1.17 × 4 =
2. 2.38 × 4 =
3. 3.43 × 100 =
4. 4.Magic trick! Think of 12. Double it, add 6, halve it, then take away 12. What number do you get?
5. 5.What comes next? 25, 36, 49, 64, ? (a) 82 (b) 83 (c) 79 (d) 81
6. 6.1 + 2 + 3 + … + 26 =
7. 7.49 × 4 =
8. 8.Double 71 =
9. 9.I thought of a number, added 9 and then doubled it. I got 36. What was my number?
10. 10.56 × 4 =
11. 11.9 × 7 =
12. 12.17 × ? = 17000
13. 13.Double 22 =
14. 14.Magic square (every row, column and diagonal has the same total): 10 20 18 | 24 16 8 | ? 12 22. What is the missing number?
15. 15.Magic square (every row, column and diagonal has the same total): 9 2 7 | ? 6 8 | 5 10 3. What is the missing number?
16. 16.Magic square (every row, column and diagonal has the same total): 10 5 12 | 11 9 7 | ? 13 8. What is the missing number?
17. 17.Think of 15. Multiply it by 5, then add 5. What number do you end with?
18. 18.9 × 9 =
19. 19.9 × 4 =
20. 20.Half of 112 =
21. 21.Take 713. Reverse its digits and take the smaller number away from the bigger one. What do you get?
22. 22.1 + 2 + 3 + … + 68 =
23. 23.40 × ? = 40000
24. 24.Magic trick! Think of 17. Double it, add 14, halve it, then take away 17. What number do you get?
25. 25.253? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
26. 26.9 × 2 =
27. 27.Half of 62 =
28. 28.7 × 9 =
29. 29.Take 24 and take away the sum of its digits. What do you get?
30. 30.15?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
31. 31.7?76 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
32. 32.4 × 9 =
33. 33.Take 25 and take away the sum of its digits. What do you get?
34. 34.9 × 7 = ?3 — what is the missing digit?
35. 35.Magic square (every row, column and diagonal has the same total): 6 1 8 | ? 5 3 | 2 9 4. What is the missing number?
36. 36.45 × 4 =
37. 37.Take 744. Reverse its digits and take the smaller number away from the bigger one. What do you get?
38. 38.1 + 2 + 3 + … + 25 =
39. 39.I thought of a number, multiplied it by 4 and added 5. I got 17. What was my number?
40. 40.502? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

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