Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 849 · 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. 1.9 × 9 =
2. 2.123 × 8 + 3 =
3. 3.594 + 495 =
4. 4.Magic square (every row, column and diagonal has the same total): 6 7 2 | 1 ? 9 | 8 3 4. What is the missing number?
5. 5.Do the 1089 trick with 910: reverse and subtract, then reverse that answer and add. What do you get?
6. 6.If today is Thursday, what day will it be after 96 days? (a) Wednesday (b) Friday (c) Monday (d) Tuesday
7. 7.111111 × 111111 =
8. 8.9 × 6 = 5? — what is the missing digit?
9. 9.9 × 4 = 3? — what is the missing digit?
10. 10.I thought of a number, multiplied it by 5 and added 4. I got 44. What was my number?
11. 11.What comes next? 36, 49, 64, 81, ? (a) 100 (b) 98 (c) 102 (d) 101
12. 12.12345 × 9 + 6 =
13. 13.85 × 100 =
14. 14.34 × 4 =
15. 15.1 + 2 + 3 + … + 11 =
16. 16.Take 55 and take away the sum of its digits. What do you get?
17. 17.What comes next? 2, 4, 8, 16, ? (a) 32 (b) 28 (c) 24 (d) 33
18. 18.1234567 × 9 + 8 =
19. 19.1234567 × 8 + 7 =
20. 20.37 × 24 =
21. 21.1 + 2 + 3 + … + 87 =
22. 22.37 × 3 =
23. 23.123456789 × 8 + 9 =
24. 24.28 × 4 =
25. 25.9 × 5 = ?5 — what is the missing digit?
26. 26.If today is Monday, what day will it be after 29 days? (a) Monday (b) Wednesday (c) Friday (d) Tuesday
27. 27.1 + 2 + 3 + … + 61 =
28. 28.8 × 9 =
29. 29.I thought of a number, added 1 and then doubled it. I got 38. What was my number?
30. 30.11 × 4 =
31. 31.Magic square (every row, column and diagonal has the same total): 17 32 11 | 14 20 ? | 29 8 23. What is the missing number?
32. 32.What comes next? 4, 8, 16, 32, ? (a) 64 (b) 48 (c) 65 (d) 56
33. 33.9 × 3 = ?7 — what is the missing digit?
34. 34.What comes next? 5, 10, 20, 40, ? (a) 60 (b) 81 (c) 70 (d) 80
35. 35.Do the 1089 trick with 804: reverse and subtract, then reverse that answer and add. What do you get?
36. 36.I thought of a number, multiplied it by 2 and added 5. I got 15. What was my number?
37. 37.Magic square (every row, column and diagonal has the same total): 13 15 5 | 3 11 ? | 17 7 9. What is the missing number?
38. 38.24 × 100 =
39. 39.Do the 1089 trick with 980: reverse and subtract, then reverse that answer and add. What do you get?
40. 40.54 × 4 =

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