Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 302 · 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. 1.8 × 9 =
2. 2.42 × 100 =
3. 3.10 × 9 =
4. 4.1 + 3 + 5 + … + 27 =
5. 5.9 × 1 =
6. 6.What comes next? 25, 36, 49, 64, ? (a) 81 (b) 83 (c) 82 (d) 79
7. 7.Magic square (every row, column and diagonal has the same total): 11 16 ? | 10 12 14 | 15 8 13. What is the missing number?
8. 8.560 × 10 =
9. 9.25 × 1000 =
10. 10.Magic square (every row, column and diagonal has the same total): 9 ? 11 | 10 8 6 | 5 12 7. What is the missing number?
11. 11.1 + 3 + 5 + … + 29 =
12. 12.1 + 2 + 3 + … + 36 =
13. 13.1 + 2 + 3 + … + 97 =
14. 14.The 1st of a month is a Wednesday. What day is the 10th of the same month? (a) Friday (b) Saturday (c) Thursday (d) Monday
15. 15.15 × 4 =
16. 16.I thought of a number, added 6 and then doubled it. I got 46. What was my number?
17. 17.Magic trick! Think of 4. Double it, add 4, halve it, then take away 4. What number do you get?
18. 18.9 × 10 = 9? — what is the missing digit?
19. 19.9 × 8 = 7? — what is the missing digit?
20. 20.What comes next? 16, 25, 36, 49, ? (a) 62 (b) 65 (c) 66 (d) 64
21. 21.Double 22 =
22. 22.47 × 4 =
23. 23.What comes next? 1, 4, 9, 16, ? (a) 25 (b) 23 (c) 26 (d) 27
24. 24.Take 67 and take away the sum of its digits. What do you get?
25. 25.The ages of two twins add up to 20. How old is each twin?
26. 26.2 × ? = 200
27. 27.41 × 1000 =
28. 28.Take 711. Reverse its digits and take the smaller number away from the bigger one. What do you get?
29. 29.What comes next? 17, 23, 29, 35, ? (a) 35 (b) 42 (c) 41 (d) 47
30. 30.Take 64 and take away the sum of its digits. What do you get?
31. 31.If today is Friday, what day will it be after 73 days? (a) Monday (b) Thursday (c) Sunday (d) Tuesday
32. 32.Take 27 and take away the sum of its digits. What do you get?
33. 33.37 × 4 =
34. 34.Magic trick! Think of 14. Double it, add 12, halve it, then take away 14. What number do you get?
35. 35.44 × 4 =
36. 36.1234 × 9 + 5 =
37. 37.Take 97 and take away the sum of its digits. What do you get?
38. 38.1 + 2 + 3 + … + 65 =
39. 39.3 × 1000 =
40. 40.891 + 198 =

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