Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 340 · 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.Half of 82 =
2. 2.9 × 9 = 8? — what is the missing digit?
3. 3.7 × 4 =
4. 4.In 3 years a boy will be 14 years old. How old was he 6 years ago?
5. 5.Magic square (every row, column and diagonal has the same total): 9 19 5 | 7 11 ? | 17 3 13. What is the missing number?
6. 6.Magic square (every row, column and diagonal has the same total): 14 4 18 | 16 ? 8 | 6 20 10. What is the missing number?
7. 7.Half of 94 =
8. 8.27 × 4 =
9. 9.12345 × 8 + 5 =
10. 10.6?01 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
11. 11.Double 57 =
12. 12.7 × 9 =
13. 13.Think of 5. Multiply it by 3, then add 7. What number do you end with?
14. 14.1 + 2 + 3 + … + 39 =
15. 15.Magic square (every row, column and diagonal has the same total): 7 12 11 | 14 10 6 | ? 8 13. What is the missing number?
16. 16.Do the 1089 trick with 319: reverse and subtract, then reverse that answer and add. What do you get?
17. 17.5 × 9 =
18. 18.1 + 3 + 5 + … + 49 =
19. 19.I thought of a number, multiplied it by 5 and added 7. I got 37. What was my number?
20. 20.12345679 × 36 =
21. 21.11111 × 11111 =
22. 22.Magic square (every row, column and diagonal has the same total): 14 15 10 | 9 13 17 | 16 11 ?. What is the missing number?
23. 23.Odd one out: which number is NOT in the 5 times table? (a) 40 (b) 49 (c) 10 (d) 25
24. 24.52 × 4 =
25. 25.9 × 3 = ?7 — what is the missing digit?
26. 26.921 × 10 =
27. 27.9 × 10 = ?0 — what is the missing digit?
28. 28.?506 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
29. 29.12345679 × 27 =
30. 30.1 + 3 + 5 + … + 11 =
31. 31.9 × 1 =
32. 32.1234567 × 8 + 7 =
33. 33.9 × 3 = 2? — what is the missing digit?
34. 34.A girl is 10 years old and her brother is 3 years older. How old will her brother be in 6 years?
35. 35.Magic square (every row, column and diagonal has the same total): 6 5 10 | 11 7 3 | 4 ? 8. What is the missing number?
36. 36.Do the 1089 trick with 672: reverse and subtract, then reverse that answer and add. What do you get?
37. 37.1 + 3 + 5 + … + 43 =
38. 38.60 × 4 =
39. 39.Magic square (every row, column and diagonal has the same total): 12 22 8 | 10 14 18 | 20 ? 16. What is the missing number?
40. 40.If today is Monday, what day will it be after 24 days? (a) Friday (b) Sunday (c) Wednesday (d) Thursday

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