Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 700 · 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 × 9 =
2. 2.996 × 10 =
3. 3.41 × ? = 4100
4. 4.If today is Saturday, what day was it 34 days ago? (a) Sunday (b) Saturday (c) Wednesday (d) Monday
5. 5.I thought of a number, added 7 and then doubled it. I got 40. What was my number?
6. 6.A girl is 12 years old and her brother is 3 years older. How old will her brother be in 4 years?
7. 7.Take 62 and take away the sum of its digits. What do you get?
8. 8.A girl is 12 years old and her brother is 6 years older. How old will her brother be in 4 years?
9. 9.826 × 10 =
10. 10.What comes next? 1, 2, 4, 8, ? (a) 16 (b) 17 (c) 14 (d) 12
11. 11.What comes next? 1, 4, 9, 16, ? (a) 27 (b) 26 (c) 23 (d) 25
12. 12.Half of 192 =
13. 13.111111 × 111111 =
14. 14.Magic square (every row, column and diagonal has the same total): 12 22 8 | 10 14 18 | 20 6 ?. What is the missing number?
15. 15.832? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
16. 16.Half of 182 =
17. 17.Do the 1089 trick with 210: reverse and subtract, then reverse that answer and add. What do you get?
18. 18.12 × 8 + 2 =
19. 19.348 × 10 =
20. 20.Magic square (every row, column and diagonal has the same total): 20 35 ? | 17 23 29 | 32 11 26. What is the missing number?
21. 21.12345678 × 9 + 9 =
22. 22.1 + 2 + 3 + … + 77 =
23. 23.693 + 396 =
24. 24.What comes next? 17, 23, 29, 35, ? (a) 47 (b) 35 (c) 42 (d) 41
25. 25.If today is Saturday, what day will it be after 44 days? (a) Tuesday (b) Thursday (c) Sunday (d) Monday
26. 26.7 × 9 =
27. 27.Half of 112 =
28. 28.I thought of a number, added 3 and then doubled it. I got 40. What was my number?
29. 29.Take 21 and take away the sum of its digits. What do you get?
30. 30.The 4th of a month is a Friday. What day is the 18th of the same month? (a) Thursday (b) Saturday (c) Friday (d) Monday
31. 31.Do the 1089 trick with 824: reverse and subtract, then reverse that answer and add. What do you get?
32. 32.17 × 1000 =
33. 33.11 × 11 =
34. 34.1 + 2 + 3 + … + 91 =
35. 35.52 × 4 =
36. 36.17 × 4 =
37. 37.If today is Saturday, what day was it 38 days ago? (a) Tuesday (b) Saturday (c) Wednesday (d) Thursday
38. 38.?377 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
39. 39.707 × ? = 7070
40. 40.Magic square (every row, column and diagonal has the same total): 17 19 9 | 7 15 23 | 21 11 ?. What is the missing number?

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