Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 509 · 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. 1.9 × 8 = ?2 — what is the missing digit?
2. 2.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
3. 3.1 + 2 + 3 + … + 73 =
4. 4.9 × 3 = ?7 — what is the missing digit?
5. 5.What comes next? 16, 25, 36, 49, ? (a) 62 (b) 65 (c) 66 (d) 64
6. 6.2 × 9 =
7. 7.9 × 7 = ?3 — what is the missing digit?
8. 8.Magic trick! Think of 2. Double it, add 10, halve it, then take away 2. What number do you get?
9. 9.Double 51 =
10. 10.20 × 10 =
11. 11.Magic square (every row, column and diagonal has the same total): 16 6 8 | 2 10 ? | 12 14 4. What is the missing number?
12. 12.1 + 2 + 3 + … + 34 =
13. 13.Double 81 =
14. 14.71 × 100 =
15. 15.Magic square (every row, column and diagonal has the same total): 15 ? 21 | 30 24 18 | 27 12 33. What is the missing number?
16. 16.495 + 594 =
17. 17.9 × 5 =
18. 18.8 × 9 =
19. 19.323? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
20. 20.I thought of a number, added 1 and then doubled it. I got 30. What was my number?
21. 21.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
22. 22.Magic square (every row, column and diagonal has the same total): 21 24 ? | 6 18 30 | 27 12 15. What is the missing number?
23. 23.111111 × 111111 =
24. 24.4 × 9 =
25. 25.Do the 1089 trick with 933: reverse and subtract, then reverse that answer and add. What do you get?
26. 26.9 × 9 = ?1 — what is the missing digit?
27. 27.If today is Saturday, what day will it be after 41 days? (a) Friday (b) Saturday (c) Monday (d) Thursday
28. 28.9 × 1 =
29. 29.123456 × 8 + 6 =
30. 30.123456 × 9 + 7 =
31. 31.Double 62 =
32. 32.Odd one out: which number is NOT in the 6 times table? (a) 28 (b) 42 (c) 18 (d) 36
33. 33.25 × 4 =
34. 34.733 × 10 =
35. 35.Double 89 =
36. 36.20 × 4 =
37. 37.9 × 6 = 5? — what is the missing digit?
38. 38.A girl is 11 years old and her brother is 4 years older. How old will her brother be in 7 years?
39. 39.9 × 2 = ?8 — what is the missing digit?
40. 40.I thought of a number, added 7 and then doubled it. I got 42. What was my number?

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