Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 510 · 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.Magic square (every row, column and diagonal has the same total): 24 27 12 | 9 21 33 | ? 15 18. What is the missing number?
2. 2.8 × 9 =
3. 3.48 × 4 =
4. 4.9 × 9 = 8? — what is the missing digit?
5. 5.Take 75 and take away the sum of its digits. What do you get?
6. 6.Take 765. Reverse its digits and take the smaller number away from the bigger one. What do you get?
7. 7.Half of 82 =
8. 8.Take 250. Reverse its digits and take the smaller number away from the bigger one. What do you get?
9. 9.Take 804. Reverse its digits and take the smaller number away from the bigger one. What do you get?
10. 10.Magic square (every row, column and diagonal has the same total): 8 9 ? | 3 7 11 | 10 5 6. What is the missing number?
11. 11.I thought of a number, multiplied it by 3 and added 7. I got 28. What was my number?
12. 12.In 2 years a boy will be 14 years old. How old was he 7 years ago?
13. 13.I thought of a number, added 1 and then doubled it. I got 42. What was my number?
14. 14.Magic trick! Think of 17. Double it, add 16, halve it, then take away 17. What number do you get?
15. 15.Magic square (every row, column and diagonal has the same total): 15 16 11 | ? 14 18 | 17 12 13. What is the missing number?
16. 16.Do the 1089 trick with 331: reverse and subtract, then reverse that answer and add. What do you get?
17. 17.A girl is 10 years old and her brother is 3 years older. How old will her brother be in 2 years?
18. 18.5 × 9 =
19. 19.40 × 4 =
20. 20.Do the 1089 trick with 549: reverse and subtract, then reverse that answer and add. What do you get?
21. 21.45 × ? = 45000
22. 22.If today is Sunday, what day will it be after 38 days? (a) Tuesday (b) Thursday (c) Saturday (d) Wednesday
23. 23.The 9th of a month is a Saturday. What day is the 28th of the same month? (a) Friday (b) Wednesday (c) Sunday (d) Thursday
24. 24.1 + 2 + 3 + … + 41 =
25. 25.22 × 100 =
26. 26.?524 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
27. 27.32 × 4 =
28. 28.Magic square (every row, column and diagonal has the same total): ? 16 11 | 14 12 10 | 13 8 15. What is the missing number?
29. 29.I thought of a number, multiplied it by 2 and added 1. I got 11. What was my number?
30. 30.9 × 5 = 4? — what is the missing digit?
31. 31.Take 29 and take away the sum of its digits. What do you get?
32. 32.396 + 693 =
33. 33.1 + 3 + 5 + … + 49 =
34. 34.44 × 1000 =
35. 35.9 × 3 = ?7 — what is the missing digit?
36. 36.145 × 10 =
37. 37.9 × 7 = ?3 — what is the missing digit?
38. 38.What comes next? 11, 13, 15, 17, ? (a) 20 (b) 21 (c) 17 (d) 19
39. 39.4 × 9 =
40. 40.A girl is 5 years old and her brother is 3 years older. How old will her brother be in 7 years?

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