Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 611 · 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.Do the 1089 trick with 940: reverse and subtract, then reverse that answer and add. What do you get?
2. 2.9 × 9 =
3. 3.9 × 7 =
4. 4.Half of 108 =
5. 5.42 × 4 =
6. 6.What comes next? 25, 36, 49, 64, ? (a) 83 (b) 81 (c) 79 (d) 82
7. 7.10 × 4 =
8. 8.1 + 2 + 3 + … + 46 =
9. 9.The ages of two twins add up to 30. How old is each twin?
10. 10.Take 14 and take away the sum of its digits. What do you get?
11. 11.5 × 1000 =
12. 12.The ages of two twins add up to 14. How old is each twin?
13. 13.Do the 1089 trick with 702: reverse and subtract, then reverse that answer and add. What do you get?
14. 14.Magic square (every row, column and diagonal has the same total): 5 12 7 | 10 ? 6 | 9 4 11. What is the missing number?
15. 15.In 5 years a boy will be 17 years old. How old was he 7 years ago?
16. 16.Take 755. Reverse its digits and take the smaller number away from the bigger one. What do you get?
17. 17.10 × 9 =
18. 18.9 × 10 =
19. 19.1 + 2 + 3 + … + 58 =
20. 20.37 × 9 =
21. 21.8 × 9 =
22. 22.40 × 1000 =
23. 23.In 5 years a boy will be 14 years old. How old was he 4 years ago?
24. 24.Magic square (every row, column and diagonal has the same total): 30 9 24 | 15 21 ? | 18 33 12. What is the missing number?
25. 25.6 × 9 =
26. 26.352 × 10 =
27. 27.If today is Monday, what day was it 20 days ago? (a) Friday (b) Wednesday (c) Tuesday (d) Monday
28. 28.Half of 102 =
29. 29.51 × 100 =
30. 30.Magic square (every row, column and diagonal has the same total): 18 ? 14 | 8 12 16 | 10 20 6. What is the missing number?
31. 31.15 × 4 =
32. 32.Magic square (every row, column and diagonal has the same total): 14 9 16 | 15 13 11 | 10 ? 12. What is the missing number?
33. 33.Double 82 =
34. 34.111 × 111 =
35. 35.17 × 4 =
36. 36.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
37. 37.Take 920. Reverse its digits and take the smaller number away from the bigger one. What do you get?
38. 38.If today is Sunday, what day was it 39 days ago? (a) Saturday (b) Tuesday (c) Thursday (d) Wednesday
39. 39.If today is Saturday, what day will it be after 48 days? (a) Monday (b) Saturday (c) Thursday (d) Friday
40. 40.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?

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