Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 987 · 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.Think of 4. Multiply it by 2, then add 8. What number do you end with?
2. 2.2 × 9 =
3. 3.2?70 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
4. 4.71 × ? = 7100
5. 5.If today is Wednesday, what day will it be after 83 days? (a) Wednesday (b) Friday (c) Tuesday (d) Monday
6. 6.1 + 2 + 3 + … + 71 =
7. 7.33 × 100 =
8. 8.45 × 4 =
9. 9.8 × 9 =
10. 10.12 × 4 =
11. 11.If today is Sunday, what day will it be after 57 days? (a) Sunday (b) Thursday (c) Tuesday (d) Monday
12. 12.If today is Sunday, what day will it be after 75 days? (a) Saturday (b) Friday (c) Thursday (d) Monday
13. 13.142 × ? = 1420
14. 14.19 × 4 =
15. 15.The 2nd of a month is a Saturday. What day is the 18th of the same month? (a) Sunday (b) Monday (c) Tuesday (d) Thursday
16. 16.If today is Wednesday, what day will it be after 91 days? (a) Thursday (b) Tuesday (c) Saturday (d) Wednesday
17. 17.37 × 15 =
18. 18.1234567 × 9 + 8 =
19. 19.9 × 5 =
20. 20.52 × 100 =
21. 21.37 × 9 =
22. 22.A girl is 12 years old and her brother is 5 years older. How old will her brother be in 6 years?
23. 23.3 × 9 =
24. 24.Take 11 and take away the sum of its digits. What do you get?
25. 25.9 × 3 = ?7 — what is the missing digit?
26. 26.Magic square (every row, column and diagonal has the same total): 21 11 13 | ? 15 23 | 17 19 9. What is the missing number?
27. 27.Magic square (every row, column and diagonal has the same total): 11 16 9 | 10 12 14 | 15 8 ?. What is the missing number?
28. 28.Take 920. Reverse its digits and take the smaller number away from the bigger one. What do you get?
29. 29.9 × 1000 =
30. 30.Take 74 and take away the sum of its digits. What do you get?
31. 31.31 × 4 =
32. 32.Do the 1089 trick with 654: reverse and subtract, then reverse that answer and add. What do you get?
33. 33.11 × 4 =
34. 34.6 × 9 =
35. 35.757? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
36. 36.Odd one out: which number is NOT in the 5 times table? (a) 12 (b) 35 (c) 40 (d) 20
37. 37.9 × 2 =
38. 38.Half of 42 =
39. 39.52 × 4 =
40. 40.28 × 4 =

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