Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 178 · 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.A father is 33 years old and his son is 14. How old was the father when the son was born?
2. 2.Take 74 and take away the sum of its digits. What do you get?
3. 3.?816 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
4. 4.43 × 4 =
5. 5.What comes next? 14, 23, 32, 41, ? (a) 59 (b) 51 (c) 50 (d) 41
6. 6.644 × 10 =
7. 7.What comes next? 16, 19, 22, 25, ? (a) 29 (b) 31 (c) 25 (d) 28
8. 8.37 × 12 =
9. 9.What comes next? 8, 14, 20, 26, ? (a) 38 (b) 32 (c) 26 (d) 33
10. 10.234? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
11. 11.Magic square (every row, column and diagonal has the same total): 15 13 ? | 25 17 9 | 11 21 19. What is the missing number?
12. 12.212? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
13. 13.50 × 4 =
14. 14.9 × 9 =
15. 15.9 × 6 =
16. 16.20 × 1000 =
17. 17.9 × 9 = 8? — what is the missing digit?
18. 18.What comes next? 17, 24, 31, 38, ? (a) 38 (b) 45 (c) 52 (d) 46
19. 19.Double 83 =
20. 20.I thought of a number, multiplied it by 3 and added 3. I got 30. What was my number?
21. 21.91 × ? = 9100
22. 22.If today is Monday, what day was it 53 days ago? (a) Wednesday (b) Friday (c) Sunday (d) Thursday
23. 23.12 × 4 =
24. 24.9 × 3 = ?7 — what is the missing digit?
25. 25.Magic square (every row, column and diagonal has the same total): 7 ? 9 | 8 6 4 | 3 10 5. What is the missing number?
26. 26.Double 31 =
27. 27.5 × 9 =
28. 28.18 × 4 =
29. 29.6 × 4 =
30. 30.If today is Wednesday, what day was it 38 days ago? (a) Sunday (b) Saturday (c) Monday (d) Wednesday
31. 31.9 × 3 =
32. 32.49 × 100 =
33. 33.Magic trick! Think of 17. Double it, add 18, halve it, then take away 17. What number do you get?
34. 34.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
35. 35.54 × 4 =
36. 36.9 × 10 =
37. 37.1 + 2 + 3 + … + 55 =
38. 38.Magic trick! Think of 7. Double it, add 4, halve it, then take away 7. What number do you get?
39. 39.2 × 9 =
40. 40.11111 × 11111 =

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