Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 323 · 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.What comes next? 36, 49, 64, 81, ? (a) 98 (b) 100 (c) 101 (d) 102
2. 2.45 × 100 =
3. 3.9 × 9 = ?1 — what is the missing digit?
4. 4.9 × 9 =
5. 5.If today is Sunday, what day will it be after 92 days? (a) Tuesday (b) Monday (c) Thursday (d) Sunday
6. 6.49 × 4 =
7. 7.2 × 9 =
8. 8.What comes next? 5, 10, 20, 40, ? (a) 81 (b) 60 (c) 70 (d) 80
9. 9.Take 89 and take away the sum of its digits. What do you get?
10. 10.Do the 1089 trick with 397: reverse and subtract, then reverse that answer and add. What do you get?
11. 11.A father is 31 years old and his son is 13. How old was the father when the son was born?
12. 12.9 × 6 = 5? — what is the missing digit?
13. 13.1 + 2 + 3 + … + 45 =
14. 14.68?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
15. 15.Half of 86 =
16. 16.1 + 2 + 3 + … + 33 =
17. 17.I thought of a number, added 9 and then doubled it. I got 38. What was my number?
18. 18.33 × 4 =
19. 19.1111 × 1111 =
20. 20.Double 91 =
21. 21.Double 81 =
22. 22.Double 52 =
23. 23.A girl is 7 years old and her brother is 2 years older. How old will her brother be in 6 years?
24. 24.Take 397. Reverse its digits and take the smaller number away from the bigger one. What do you get?
25. 25.22 × 4 =
26. 26.1 + 2 + 3 + … + 46 =
27. 27.Magic trick! Think of 10. Double it, add 8, halve it, then take away 10. What number do you get?
28. 28.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
29. 29.If today is Monday, what day will it be after 98 days? (a) Monday (b) Tuesday (c) Thursday (d) Sunday
30. 30.Do the 1089 trick with 254: reverse and subtract, then reverse that answer and add. What do you get?
31. 31.496 × 10 =
32. 32.1 + 2 + 3 + … + 57 =
33. 33.Take 90 and take away the sum of its digits. What do you get?
34. 34.Do the 1089 trick with 890: reverse and subtract, then reverse that answer and add. What do you get?
35. 35.If today is Friday, what day will it be after 62 days? (a) Sunday (b) Wednesday (c) Friday (d) Thursday
36. 36.19 × 100 =
37. 37.12345 × 9 + 6 =
38. 38.14 × 4 =
39. 39.26 × 4 =
40. 40.1 + 3 + 5 + … + 45 =

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