Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 758 · 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.Double 63 =
2. 2.The ages of two twins add up to 16. How old is each twin?
3. 3.636 × 10 =
4. 4.Half of 124 =
5. 5.9 × 7 = ?3 — what is the missing digit?
6. 6.13 × 1000 =
7. 7.9 × 10 = ?0 — what is the missing digit?
8. 8.If today is Monday, what day will it be after 20 days? (a) Monday (b) Sunday (c) Wednesday (d) Saturday
9. 9.9 × 8 =
10. 10.610 × 10 =
11. 11.12345679 × 63 =
12. 12.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
13. 13.Double 27 =
14. 14.If today is Monday, what day was it 55 days ago? (a) Monday (b) Tuesday (c) Friday (d) Wednesday
15. 15.12345 × 9 + 6 =
16. 16.31 × 4 =
17. 17.Magic trick! Think of 10. Double it, add 10, halve it, then take away 10. What number do you get?
18. 18.9 × 2 = ?8 — what is the missing digit?
19. 19.Take 40 and take away the sum of its digits. What do you get?
20. 20.70?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
21. 21.9 × 5 = ?5 — what is the missing digit?
22. 22.7 × 9 =
23. 23.1111 × 1111 =
24. 24.Magic square (every row, column and diagonal has the same total): 17 7 ? | 19 15 11 | 9 23 13. What is the missing number?
25. 25.What comes next? 1, 2, 4, 8, ? (a) 12 (b) 14 (c) 17 (d) 16
26. 26.9 × 4 = 3? — what is the missing digit?
27. 27.If today is Sunday, what day was it 34 days ago? (a) Thursday (b) Monday (c) Sunday (d) Tuesday
28. 28.If today is Monday, what day was it 59 days ago? (a) Thursday (b) Saturday (c) Friday (d) Monday
29. 29.12345679 × 81 =
30. 30.I thought of a number, multiplied it by 4 and added 9. I got 45. What was my number?
31. 31.Half of 116 =
32. 32.The 3rd of a month is a Saturday. What day is the 22nd of the same month? (a) Sunday (b) Friday (c) Thursday (d) Wednesday
33. 33.52 × 4 =
34. 34.Half of 102 =
35. 35.If today is Wednesday, what day will it be after 75 days? (a) Sunday (b) Monday (c) Thursday (d) Tuesday
36. 36.1 + 2 + 3 + … + 18 =
37. 37.1 + 2 + 3 + … + 21 =
38. 38.Take 600. Reverse its digits and take the smaller number away from the bigger one. What do you get?
39. 39.Magic square (every row, column and diagonal has the same total): 14 ? 22 | 24 16 8 | 10 20 18. What is the missing number?
40. 40.29 × 4 =

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