Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 42 · 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. 1.9 × 6 = 5? — what is the missing digit?
2. 2.Take 926. Reverse its digits and take the smaller number away from the bigger one. What do you get?
3. 3.Do the 1089 trick with 397: reverse and subtract, then reverse that answer and add. What do you get?
4. 4.1 + 2 + 3 + … + 22 =
5. 5.9 × 1 =
6. 6.The 2nd of a month is a Thursday. What day is the 27th of the same month? (a) Tuesday (b) Monday (c) Thursday (d) Sunday
7. 7.12 × 4 =
8. 8.1 + 2 + 3 + … + 85 =
9. 9.The ages of two twins add up to 8. How old is each twin?
10. 10.12345679 × 81 =
11. 11.37 × 15 =
12. 12.17 × ? = 17000
13. 13.24 × 4 =
14. 14.12345679 × 27 =
15. 15.9 × 7 = ?3 — what is the missing digit?
16. 16.Double 81 =
17. 17.In 5 years a boy will be 13 years old. How old was he 2 years ago?
18. 18.191 × 10 =
19. 19.Think of 15. Multiply it by 4, then add 2. What number do you end with?
20. 20.1 + 2 + 3 + … + 27 =
21. 21.The 5th of a month is a Monday. What day is the 30th of the same month? (a) Thursday (b) Monday (c) Saturday (d) Friday
22. 22.1 + 2 + 3 + … + 45 =
23. 23.25 × 4 =
24. 24.13 × 4 =
25. 25.Take 914. Reverse its digits and take the smaller number away from the bigger one. What do you get?
26. 26.13?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
27. 27.Double 84 =
28. 28.Odd one out: which number is NOT in the 9 times table? (a) 72 (b) 58 (c) 36 (d) 45
29. 29.Half of 42 =
30. 30.If today is Wednesday, what day will it be after 63 days? (a) Tuesday (b) Thursday (c) Wednesday (d) Saturday
31. 31.1 + 2 + 3 + … + 16 =
32. 32.8 × 9 =
33. 33.The ages of two twins add up to 12. How old is each twin?
34. 34.Odd one out: which number is NOT in the 8 times table? (a) 54 (b) 16 (c) 48 (d) 24
35. 35.594 + 495 =
36. 36.A girl is 5 years old and her brother is 2 years older. How old will her brother be in 5 years?
37. 37.1 + 3 + 5 + … + 47 =
38. 38.297 + 792 =
39. 39.If today is Sunday, what day will it be after 86 days? (a) Tuesday (b) Wednesday (c) Monday (d) Friday
40. 40.1 + 3 + 5 + … + 21 =

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