Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 454 · 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. 1.1?32 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
2. 2.9 × 10 =
3. 3.37 × 12 =
4. 4.71 × 100 =
5. 5.12345679 × 9 =
6. 6.1 + 2 + 3 + … + 48 =
7. 7.3 × 100 =
8. 8.24 × 4 =
9. 9.The 5th of a month is a Friday. What day is the 17th of the same month? (a) Wednesday (b) Thursday (c) Tuesday (d) Saturday
10. 10.28 × 100 =
11. 11.6 × 4 =
12. 12.297 + 792 =
13. 13.438? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
14. 14.39 × 100 =
15. 15.If today is Sunday, what day was it 24 days ago? (a) Thursday (b) Wednesday (c) Sunday (d) Friday
16. 16.I thought of a number, added 8 and then doubled it. I got 34. What was my number?
17. 17.134? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
18. 18.Half of 82 =
19. 19.9 × 9 = 8? — what is the missing digit?
20. 20.9 × 5 =
21. 21.Magic square (every row, column and diagonal has the same total): 14 35 20 | 29 23 ? | 26 11 32. What is the missing number?
22. 22.1 + 2 + 3 + … + 40 =
23. 23.1 + 2 + 3 + … + 89 =
24. 24.If today is Monday, what day was it 55 days ago? (a) Friday (b) Wednesday (c) Tuesday (d) Monday
25. 25.A father is 36 years old and his son is 4. How old was the father when the son was born?
26. 26.I thought of a number, added 1 and then doubled it. I got 40. What was my number?
27. 27.30?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
28. 28.9 × 10 = 9? — what is the missing digit?
29. 29.9 × 1 =
30. 30.1 + 3 + 5 + … + 21 =
31. 31.Do the 1089 trick with 570: reverse and subtract, then reverse that answer and add. What do you get?
32. 32.Magic square (every row, column and diagonal has the same total): 13 3 17 | 15 11 7 | 5 19 ?. What is the missing number?
33. 33.Double 63 =
34. 34.Magic square (every row, column and diagonal has the same total): 13 12 ? | 18 14 10 | 11 16 15. What is the missing number?
35. 35.805 × 10 =
36. 36.9 × 6 = ?4 — what is the missing digit?
37. 37.Magic square (every row, column and diagonal has the same total): 14 9 10 | ? 11 15 | 12 13 8. What is the missing number?
38. 38.9 × 8 =
39. 39.194 × 10 =
40. 40.Half of 168 =

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