Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 263 · 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 86 =
2. 2.2 × 9 =
3. 3.A father is 38 years old and his son is 14. How old was the father when the son was born?
4. 4.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
5. 5.34 × ? = 3400
6. 6.39 × 4 =
7. 7.What comes next? 18, 24, 30, 36, ? (a) 43 (b) 48 (c) 42 (d) 36
8. 8.What comes next? 3, 12, 21, 30, ? (a) 30 (b) 40 (c) 48 (d) 39
9. 9.Take 15 and take away the sum of its digits. What do you get?
10. 10.1 + 3 + 5 + … + 15 =
11. 11.1 + 2 + 3 + … + 15 =
12. 12.1 + 2 + 3 + … + 88 =
13. 13.I thought of a number, multiplied it by 5 and added 1. I got 36. What was my number?
14. 14.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
15. 15.32 × 4 =
16. 16.21 × 4 =
17. 17.1 + 3 + 5 + … + 31 =
18. 18.3 × 9 =
19. 19.Think of 6. Multiply it by 2, then add 7. What number do you end with?
20. 20.9 × 8 = 7? — what is the missing digit?
21. 21.123 × 8 + 3 =
22. 22.Half of 182 =
23. 23.What comes next? 1, 2, 4, 8, ? (a) 17 (b) 14 (c) 12 (d) 16
24. 24.9 × 3 = 2? — what is the missing digit?
25. 25.Take 99 and take away the sum of its digits. What do you get?
26. 26.123456789 × 8 + 9 =
27. 27.What comes next? 9, 16, 25, 36, ? (a) 47 (b) 50 (c) 51 (d) 49
28. 28.Magic square (every row, column and diagonal has the same total): 7 2 9 | 8 ? 4 | 3 10 5. What is the missing number?
29. 29.6 × 9 =
30. 30.Magic square (every row, column and diagonal has the same total): 13 3 17 | 15 11 7 | ? 19 9. What is the missing number?
31. 31.What comes next? 5, 10, 20, 40, ? (a) 60 (b) 81 (c) 80 (d) 70
32. 32.Take 17 and take away the sum of its digits. What do you get?
33. 33.The 3rd of a month is a Wednesday. What day is the 17th of the same month? (a) Saturday (b) Wednesday (c) Tuesday (d) Thursday
34. 34.9 × 3 = ?7 — what is the missing digit?
35. 35.9 × 10 =
36. 36.1234 × 8 + 4 =
37. 37.Magic trick! Think of 19. Double it, add 4, halve it, then take away 19. What number do you get?
38. 38.10 × 4 =
39. 39.12345679 × 36 =
40. 40.676? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

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