Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 508 · 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. 1.1 × 9 =
2. 2.I thought of a number, multiplied it by 3 and added 7. I got 34. What was my number?
3. 3.54 × 10 =
4. 4.56 × 100 =
5. 5.11 × 1000 =
6. 6.7 × 9 =
7. 7.1 + 2 + 3 + … + 34 =
8. 8.111 × 111 =
9. 9.Magic trick! Think of 12. Double it, add 10, halve it, then take away 12. What number do you get?
10. 10.1 + 2 + 3 + … + 86 =
11. 11.Take 21 and take away the sum of its digits. What do you get?
12. 12.Take 599. Reverse its digits and take the smaller number away from the bigger one. What do you get?
13. 13.3 × 9 =
14. 14.Half of 22 =
15. 15.If today is Monday, what day will it be after 92 days? (a) Friday (b) Tuesday (c) Monday (d) Wednesday
16. 16.Double 93 =
17. 17.22 × 4 =
18. 18.12 × 1000 =
19. 19.12 × 4 =
20. 20.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
21. 21.If today is Tuesday, what day will it be after 93 days? (a) Thursday (b) Friday (c) Wednesday (d) Sunday
22. 22.9 × 3 =
23. 23.Take 37 and take away the sum of its digits. What do you get?
24. 24.83 × ? = 8300
25. 25.In 5 years a boy will be 19 years old. How old was he 4 years ago?
26. 26.12345 × 8 + 5 =
27. 27.11 × ? = 11000
28. 28.Magic square (every row, column and diagonal has the same total): 28 7 22 | ? 19 25 | 16 31 10. What is the missing number?
29. 29.111111 × 111111 =
30. 30.9 × 5 =
31. 31.40 × 1000 =
32. 32.?633 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
33. 33.1111 × 1111 =
34. 34.9 × 2 =
35. 35.Magic square (every row, column and diagonal has the same total): 26 ? 14 | 5 17 29 | 20 23 8. What is the missing number?
36. 36.53 × 4 =
37. 37.477? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
38. 38.9 × 6 =
39. 39.In 2 years a boy will be 14 years old. How old was he 2 years ago?
40. 40.Magic square (every row, column and diagonal has the same total): 22 8 18 | 12 16 20 | 14 ? 10. What is the missing number?

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