Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 360 · 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 × 4 =
2. 2.43 × 4 =
3. 3.Half of 182 =
4. 4.60 × 4 =
5. 5.Double 42 =
6. 6.Magic square (every row, column and diagonal has the same total): ? 8 10 | 4 12 20 | 14 16 6. What is the missing number?
7. 7.486 × 10 =
8. 8.1 + 2 + 3 + … + 32 =
9. 9.4 × 9 =
10. 10.66?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
11. 11.Double 61 =
12. 12.1234567 × 9 + 8 =
13. 13.Magic square (every row, column and diagonal has the same total): 20 ? 14 | 17 23 29 | 32 11 26. What is the missing number?
14. 14.1 + 2 + 3 + … + 56 =
15. 15.The 3rd of a month is a Friday. What day is the 25th of the same month? (a) Saturday (b) Tuesday (c) Friday (d) Sunday
16. 16.A father is 40 years old and his son is 8. How old was the father when the son was born?
17. 17.1234 × 9 + 5 =
18. 18.Magic square (every row, column and diagonal has the same total): 30 9 24 | ? 21 27 | 18 33 12. What is the missing number?
19. 19.I thought of a number, added 3 and then doubled it. I got 26. What was my number?
20. 20.I thought of a number, multiplied it by 2 and added 3. I got 15. What was my number?
21. 21.Magic square (every row, column and diagonal has the same total): 11 18 ? | 16 14 12 | 15 10 17. What is the missing number?
22. 22.495 + 594 =
23. 23.If today is Thursday, what day will it be after 91 days? (a) Thursday (b) Friday (c) Wednesday (d) Sunday
24. 24.343 × ? = 3430
25. 25.Take 930. Reverse its digits and take the smaller number away from the bigger one. What do you get?
26. 26.Take 87 and take away the sum of its digits. What do you get?
27. 27.Double 65 =
28. 28.9 × 10 =
29. 29.Take 916. Reverse its digits and take the smaller number away from the bigger one. What do you get?
30. 30.1 + 3 + 5 + … + 41 =
31. 31.Half of 42 =
32. 32.?543 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
33. 33.The 5th of a month is a Tuesday. What day is the 28th of the same month? (a) Thursday (b) Wednesday (c) Friday (d) Sunday
34. 34.?887 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
35. 35.891 + 198 =
36. 36.Magic square (every row, column and diagonal has the same total): 14 12 ? | 24 16 8 | 10 20 18. What is the missing number?
37. 37.9 × 4 = ?6 — what is the missing digit?
38. 38.9 × 2 = ?8 — what is the missing digit?
39. 39.37 × 12 =
40. 40.23 × 1000 =

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