Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 621 · 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.If today is Wednesday, what day will it be after 76 days? (a) Friday (b) Tuesday (c) Monday (d) Wednesday
2. 2.If today is Sunday, what day will it be after 96 days? (a) Friday (b) Saturday (c) Monday (d) Thursday
3. 3.34 × 1000 =
4. 4.Half of 128 =
5. 5.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
6. 6.What comes next? 36, 49, 64, 81, ? (a) 98 (b) 102 (c) 101 (d) 100
7. 7.2 × ? = 200
8. 8.2?61 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
9. 9.7 × 1000 =
10. 10.I thought of a number, added 7 and then doubled it. I got 34. What was my number?
11. 11.Magic square (every row, column and diagonal has the same total): ? 22 19 | 28 16 4 | 13 10 25. What is the missing number?
12. 12.Do the 1089 trick with 840: reverse and subtract, then reverse that answer and add. What do you get?
13. 13.9 × 3 = 2? — what is the missing digit?
14. 14.9 × 4 =
15. 15.If today is Sunday, what day will it be after 71 days? (a) Sunday (b) Tuesday (c) Thursday (d) Monday
16. 16.I thought of a number, added 9 and then doubled it. I got 48. What was my number?
17. 17.31 × 4 =
18. 18.9 × 2 = 1? — what is the missing digit?
19. 19.Do the 1089 trick with 900: reverse and subtract, then reverse that answer and add. What do you get?
20. 20.Think of 11. Multiply it by 2, then add 9. What number do you end with?
21. 21.Magic trick! Think of 14. Double it, add 14, halve it, then take away 14. What number do you get?
22. 22.Magic square (every row, column and diagonal has the same total): ? 9 2 | 3 5 7 | 8 1 6. What is the missing number?
23. 23.9 × 5 = ?5 — what is the missing digit?
24. 24.1 + 2 + 3 + … + 39 =
25. 25.792 + 297 =
26. 26.9 × 10 = ?0 — what is the missing digit?
27. 27.35 × 1000 =
28. 28.1 + 3 + 5 + … + 33 =
29. 29.Double 97 =
30. 30.9 × 4 = 3? — what is the missing digit?
31. 31.If today is Friday, what day was it 42 days ago? (a) Monday (b) Saturday (c) Thursday (d) Friday
32. 32.1 + 2 + 3 + … + 30 =
33. 33.10 × 9 =
34. 34.11 × 4 =
35. 35.Do the 1089 trick with 577: reverse and subtract, then reverse that answer and add. What do you get?
36. 36.Do the 1089 trick with 960: reverse and subtract, then reverse that answer and add. What do you get?
37. 37.9 × 6 =
38. 38.I thought of a number, multiplied it by 4 and added 8. I got 56. What was my number?
39. 39.39 × 1000 =
40. 40.9 × 9 = ?1 — what is the missing digit?

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