Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 470 · 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. 1.5 × 9 =
2. 2.51 × 4 =
3. 3.9 × 9 =
4. 4.12345679 × 81 =
5. 5.8 × 9 =
6. 6.46 × 100 =
7. 7.12 × 1000 =
8. 8.What comes next? 3, 6, 12, 24, ? (a) 48 (b) 49 (c) 36 (d) 42
9. 9.What comes next? 12, 15, 18, 21, ? (a) 24 (b) 27 (c) 25 (d) 21
10. 10.37 × 12 =
11. 11.693 + 396 =
12. 12.Take 54 and take away the sum of its digits. What do you get?
13. 13.Take 862. Reverse its digits and take the smaller number away from the bigger one. What do you get?
14. 14.Magic square (every row, column and diagonal has the same total): 12 10 ? | 22 14 6 | 8 18 16. What is the missing number?
15. 15.11111 × 11111 =
16. 16.9 × 6 = 5? — what is the missing digit?
17. 17.Magic square (every row, column and diagonal has the same total): 13 34 19 | ? 22 16 | 25 10 31. What is the missing number?
18. 18.If today is Friday, what day was it 36 days ago? (a) Friday (b) Thursday (c) Sunday (d) Wednesday
19. 19.744? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
20. 20.?214 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
21. 21.I thought of a number, added 8 and then doubled it. I got 48. What was my number?
22. 22.12345679 × 72 =
23. 23.In 5 years a boy will be 13 years old. How old was he 6 years ago?
24. 24.1 + 2 + 3 + … + 22 =
25. 25.9 × 4 = 3? — what is the missing digit?
26. 26.Magic square (every row, column and diagonal has the same total): 5 12 7 | 10 8 6 | ? 4 11. What is the missing number?
27. 27.A father is 41 years old and his son is 11. How old was the father when the son was born?
28. 28.Double 51 =
29. 29.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
30. 30.9 × 1 =
31. 31.1 + 2 + 3 + … + 24 =
32. 32.Double 76 =
33. 33.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
34. 34.9 × 6 = ?4 — what is the missing digit?
35. 35.297 + 792 =
36. 36.What comes next? 5, 10, 20, 40, ? (a) 70 (b) 81 (c) 80 (d) 60
37. 37.3 × 9 =
38. 38.Magic square (every row, column and diagonal has the same total): 24 9 12 | 3 15 27 | 18 21 ?. What is the missing number?
39. 39.Double 29 =
40. 40.1 × 9 =

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