Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 432 · 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. 1.12345679 × 27 =
2. 2.28 × 4 =
3. 3.123456 × 8 + 6 =
4. 4.2 × 9 =
5. 5.The 5th of a month is a Tuesday. What day is the 26th of the same month? (a) Monday (b) Wednesday (c) Tuesday (d) Friday
6. 6.54 × 100 =
7. 7.56?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
8. 8.Take 73 and take away the sum of its digits. What do you get?
9. 9.Half of 68 =
10. 10.Think of 12. Multiply it by 3, then add 1. What number do you end with?
11. 11.What comes next? 20, 24, 28, 32, ? (a) 37 (b) 40 (c) 36 (d) 32
12. 12.If today is Wednesday, what day was it 22 days ago? (a) Tuesday (b) Friday (c) Wednesday (d) Monday
13. 13.12 × 8 + 2 =
14. 14.9 × 10 = 9? — what is the missing digit?
15. 15.91 × 100 =
16. 16.A girl is 7 years old and her brother is 6 years older. How old will her brother be in 2 years?
17. 17.Double 33 =
18. 18.9 × 3 =
19. 19.9 × 9 =
20. 20.1 + 3 + 5 + … + 45 =
21. 21.74 × 100 =
22. 22.Do the 1089 trick with 741: reverse and subtract, then reverse that answer and add. What do you get?
23. 23.Magic square (every row, column and diagonal has the same total): 14 7 12 | ? 11 13 | 10 15 8. What is the missing number?
24. 24.6 × 9 =
25. 25.155 × 10 =
26. 26.What comes next? 4, 9, 16, 25, ? (a) 37 (b) 38 (c) 36 (d) 34
27. 27.12345679 × 36 =
28. 28.5 × 100 =
29. 29.12345 × 8 + 5 =
30. 30.Take 13 and take away the sum of its digits. What do you get?
31. 31.10 × 4 =
32. 32.If today is Thursday, what day will it be after 60 days? (a) Tuesday (b) Monday (c) Thursday (d) Sunday
33. 33.1 + 2 + 3 + … + 68 =
34. 34.The 1st of a month is a Friday. What day is the 28th of the same month? (a) Friday (b) Sunday (c) Thursday (d) Wednesday
35. 35.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
36. 36.Half of 64 =
37. 37.What comes next? 10, 17, 24, 31, ? (a) 45 (b) 31 (c) 39 (d) 38
38. 38.Do the 1089 trick with 520: reverse and subtract, then reverse that answer and add. What do you get?
39. 39.Magic square (every row, column and diagonal has the same total): 10 17 12 | ? 13 11 | 14 9 16. What is the missing number?
40. 40.Take 78 and take away the sum of its digits. What do you get?

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