Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 429 · 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.Take 396. Reverse its digits and take the smaller number away from the bigger one. What do you get?
2. 2.Double 51 =
3. 3.5 × ? = 5000
4. 4.297 + 792 =
5. 5.9 × 3 = ?7 — what is the missing digit?
6. 6.17 × 4 =
7. 7.Take 600. Reverse its digits and take the smaller number away from the bigger one. What do you get?
8. 8.1 + 3 + 5 + … + 25 =
9. 9.6 × 9 =
10. 10.Magic trick! Think of 5. Double it, add 18, halve it, then take away 5. What number do you get?
11. 11.What comes next? 2, 4, 8, 16, ? (a) 24 (b) 33 (c) 32 (d) 28
12. 12.Take 510. Reverse its digits and take the smaller number away from the bigger one. What do you get?
13. 13.52 × 4 =
14. 14.9 × 6 = 5? — what is the missing digit?
15. 15.In 6 years a boy will be 14 years old. How old was he 3 years ago?
16. 16.Do the 1089 trick with 540: reverse and subtract, then reverse that answer and add. What do you get?
17. 17.9 × 4 =
18. 18.592 × 10 =
19. 19.Magic square (every row, column and diagonal has the same total): 9 19 17 | 23 15 ? | 13 11 21. What is the missing number?
20. 20.Double 32 =
21. 21.9 × 9 = 8? — what is the missing digit?
22. 22.The 7th of a month is a Saturday. What day is the 22nd of the same month? (a) Saturday (b) Sunday (c) Wednesday (d) Monday
23. 23.Take 52 and take away the sum of its digits. What do you get?
24. 24.89?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
25. 25.889 × 10 =
26. 26.What comes next? 6, 10, 14, 18, ? (a) 22 (b) 18 (c) 23 (d) 26
27. 27.Odd one out: which number is NOT in the 9 times table? (a) 72 (b) 45 (c) 18 (d) 20
28. 28.9 × 7 = ?3 — what is the missing digit?
29. 29.1 + 2 + 3 + … + 35 =
30. 30.Take 492. Reverse its digits and take the smaller number away from the bigger one. What do you get?
31. 31.Magic square (every row, column and diagonal has the same total): 9 16 11 | 14 12 10 | 13 8 ?. What is the missing number?
32. 32.13 × 4 =
33. 33.2?63 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
34. 34.9 × 7 =
35. 35.16 × 4 =
36. 36.899 × ? = 8990
37. 37.649 × ? = 6490
38. 38.The 6th of a month is a Wednesday. What day is the 23rd of the same month? (a) Tuesday (b) Saturday (c) Friday (d) Sunday
39. 39.9 × 8 = ?2 — what is the missing digit?
40. 40.Magic square (every row, column and diagonal has the same total): 20 22 12 | 10 18 26 | ? 14 16. What is the missing number?

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