Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 781 · 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.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
2. 2.The 2nd of a month is a Tuesday. What day is the 15th of the same month? (a) Tuesday (b) Sunday (c) Thursday (d) Monday
3. 3.24 × ? = 2400
4. 4.11111 × 11111 =
5. 5.Do the 1089 trick with 360: reverse and subtract, then reverse that answer and add. What do you get?
6. 6.10 × 4 =
7. 7.A father is 41 years old and his son is 9. How old was the father when the son was born?
8. 8.12345678 × 9 + 9 =
9. 9.9 × 10 = ?0 — what is the missing digit?
10. 10.11 × 1000 =
11. 11.5 × 1000 =
12. 12.Half of 42 =
13. 13.Magic square (every row, column and diagonal has the same total): 16 13 28 | 31 19 ? | 10 25 22. What is the missing number?
14. 14.90 × 10 =
15. 15.9 × 4 = 3? — what is the missing digit?
16. 16.Do the 1089 trick with 815: reverse and subtract, then reverse that answer and add. What do you get?
17. 17.891 + 198 =
18. 18.1 + 3 + 5 + … + 29 =
19. 19.9 × 8 = 7? — what is the missing digit?
20. 20.1 + 2 + 3 + … + 95 =
21. 21.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
22. 22.12345678 × 8 + 8 =
23. 23.If today is Thursday, what day will it be after 22 days? (a) Thursday (b) Saturday (c) Friday (d) Monday
24. 24.If today is Monday, what day was it 57 days ago? (a) Monday (b) Sunday (c) Saturday (d) Wednesday
25. 25.1 × 9 =
26. 26.Think of 3. Multiply it by 5, then add 4. What number do you end with?
27. 27.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
28. 28.If today is Wednesday, what day was it 30 days ago? (a) Tuesday (b) Thursday (c) Sunday (d) Monday
29. 29.Odd one out: which number is NOT in the 7 times table? (a) 42 (b) 66 (c) 28 (d) 21
30. 30.Take 58 and take away the sum of its digits. What do you get?
31. 31.Double 78 =
32. 32.Double 41 =
33. 33.1 + 2 + 3 + … + 7 =
34. 34.If today is Friday, what day will it be after 51 days? (a) Wednesday (b) Monday (c) Saturday (d) Sunday
35. 35.18 × 4 =
36. 36.37 × 24 =
37. 37.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
38. 38.792 + 297 =
39. 39.Half of 114 =
40. 40.594 + 495 =

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