Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 71 · 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.The 4th of a month is a Saturday. What day is the 28th of the same month? (a) Friday (b) Wednesday (c) Tuesday (d) Monday
2. 2.Half of 102 =
3. 3.31 × 1000 =
4. 4.Odd one out: which number is NOT in the 5 times table? (a) 43 (b) 35 (c) 50 (d) 20
5. 5.Take 972. Reverse its digits and take the smaller number away from the bigger one. What do you get?
6. 6.2 × 9 =
7. 7.?74 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
8. 8.Odd one out: which number is NOT in the 3 times table? (a) 12 (b) 6 (c) 17 (d) 9
9. 9.Take 720. Reverse its digits and take the smaller number away from the bigger one. What do you get?
10. 10.What comes next? 5, 10, 20, 40, ? (a) 80 (b) 60 (c) 81 (d) 70
11. 11.If today is Tuesday, what day will it be after 32 days? (a) Saturday (b) Sunday (c) Friday (d) Tuesday
12. 12.111111 × 111111 =
13. 13.42 × 4 =
14. 14.9 × 10 =
15. 15.49 × 4 =
16. 16.Take 357. Reverse its digits and take the smaller number away from the bigger one. What do you get?
17. 17.The ages of two twins add up to 10. How old is each twin?
18. 18.Magic square (every row, column and diagonal has the same total): 12 ? 20 | 26 18 10 | 16 14 24. What is the missing number?
19. 19.Think of 13. Multiply it by 5, then add 3. What number do you end with?
20. 20.11 × 11 =
21. 21.9 × 7 =
22. 22.1 + 2 + 3 + … + 43 =
23. 23.A father is 32 years old and his son is 7. How old was the father when the son was born?
24. 24.A father is 33 years old and his son is 5. How old was the father when the son was born?
25. 25.Do the 1089 trick with 308: reverse and subtract, then reverse that answer and add. What do you get?
26. 26.9 × 3 =
27. 27.Think of 13. Multiply it by 5, then add 5. What number do you end with?
28. 28.9 × 7 = 6? — what is the missing digit?
29. 29.9 × 6 =
30. 30.852 × 10 =
31. 31.Double 14 =
32. 32.Double 87 =
33. 33.9 × 9 =
34. 34.Half of 54 =
35. 35.13 × 4 =
36. 36.A girl is 11 years old and her brother is 3 years older. How old will her brother be in 6 years?
37. 37.Think of 14. Multiply it by 2, then add 9. What number do you end with?
38. 38.1 + 3 + 5 + … + 37 =
39. 39.9 × 3 = 2? — what is the missing digit?
40. 40.Double 54 =

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