Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 357 · 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.Half of 188 =
2. 2.In 2 years a boy will be 10 years old. How old was he 7 years ago?
3. 3.Double 26 =
4. 4.9 × 7 = 6? — what is the missing digit?
5. 5.21 × ? = 21000
6. 6.If today is Friday, what day will it be after 57 days? (a) Friday (b) Sunday (c) Tuesday (d) Saturday
7. 7.123 × 8 + 3 =
8. 8.Half of 52 =
9. 9.I thought of a number, added 8 and then doubled it. I got 52. What was my number?
10. 10.If today is Tuesday, what day will it be after 30 days? (a) Friday (b) Wednesday (c) Sunday (d) Thursday
11. 11.40 × 4 =
12. 12.543 × 10 =
13. 13.9 × 2 = 1? — what is the missing digit?
14. 14.If today is Friday, what day will it be after 22 days? (a) Sunday (b) Friday (c) Saturday (d) Tuesday
15. 15.If today is Sunday, what day will it be after 95 days? (a) Thursday (b) Sunday (c) Friday (d) Wednesday
16. 16.Magic square (every row, column and diagonal has the same total): 18 20 10 | 8 16 24 | 22 ? 14. What is the missing number?
17. 17.Magic square (every row, column and diagonal has the same total): 8 ? 4 | 6 10 14 | 16 2 12. What is the missing number?
18. 18.The ages of two twins add up to 16. How old is each twin?
19. 19.9 × 10 = ?0 — what is the missing digit?
20. 20.If today is Monday, what day was it 13 days ago? (a) Wednesday (b) Monday (c) Friday (d) Tuesday
21. 21.Magic square (every row, column and diagonal has the same total): 9 4 5 | ? 6 10 | 7 8 3. What is the missing number?
22. 22.9 × 6 = ?4 — what is the missing digit?
23. 23.6 × 9 =
24. 24.1 + 3 + 5 + … + 11 =
25. 25.If today is Friday, what day was it 37 days ago? (a) Saturday (b) Tuesday (c) Wednesday (d) Thursday
26. 26.Double 63 =
27. 27.Take 20 and take away the sum of its digits. What do you get?
28. 28.A father is 38 years old and his son is 14. How old was the father when the son was born?
29. 29.What comes next? 1, 4, 9, 16, ? (a) 25 (b) 23 (c) 26 (d) 27
30. 30.4 × 9 =
31. 31.Half of 148 =
32. 32.Magic square (every row, column and diagonal has the same total): ? 13 28 | 31 19 7 | 10 25 22. What is the missing number?
33. 33.51 × 100 =
34. 34.8 × 1000 =
35. 35.What comes next? 3, 6, 12, 24, ? (a) 49 (b) 36 (c) 48 (d) 42
36. 36.Half of 56 =
37. 37.12345679 × 9 =
38. 38.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
39. 39.Take 38 and take away the sum of its digits. What do you get?
40. 40.?697 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

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