Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 484 · 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.I thought of a number, added 6 and then doubled it. I got 22. What was my number?
2. 2.Take 258. Reverse its digits and take the smaller number away from the bigger one. What do you get?
3. 3.9 × 2 =
4. 4.18 × 4 =
5. 5.Take 62 and take away the sum of its digits. What do you get?
6. 6.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
7. 7.1 + 3 + 5 + … + 45 =
8. 8.43 × 100 =
9. 9.What comes next? 9, 16, 25, 36, ? (a) 47 (b) 51 (c) 49 (d) 50
10. 10.9 × 2 = 1? — what is the missing digit?
11. 11.Think of 13. Multiply it by 4, then add 5. What number do you end with?
12. 12.If today is Sunday, what day was it 15 days ago? (a) Sunday (b) Friday (c) Tuesday (d) Saturday
13. 13.A girl is 12 years old and her brother is 4 years older. How old will her brother be in 6 years?
14. 14.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
15. 15.A father is 43 years old and his son is 5. How old was the father when the son was born?
16. 16.I thought of a number, multiplied it by 3 and added 5. I got 35. What was my number?
17. 17.Double 51 =
18. 18.9 × 10 = 9? — what is the missing digit?
19. 19.9 × 7 =
20. 20.9 × 5 =
21. 21.111 × 111 =
22. 22.If today is Wednesday, what day was it 24 days ago? (a) Wednesday (b) Monday (c) Saturday (d) Sunday
23. 23.Take 310. Reverse its digits and take the smaller number away from the bigger one. What do you get?
24. 24.580 × 10 =
25. 25.Magic square (every row, column and diagonal has the same total): 10 ? 12 | 11 9 7 | 6 13 8. What is the missing number?
26. 26.Half of 32 =
27. 27.9 × 7 = ?3 — what is the missing digit?
28. 28.If today is Tuesday, what day will it be after 55 days? (a) Tuesday (b) Monday (c) Sunday (d) Thursday
29. 29.Double 44 =
30. 30.1 + 2 + 3 + … + 74 =
31. 31.594 + 495 =
32. 32.123456 × 8 + 6 =
33. 33.967 × ? = 9670
34. 34.37 × 15 =
35. 35.9 × 3 = 2? — what is the missing digit?
36. 36.31 × 4 =
37. 37.4?10 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
38. 38.Take 48 and take away the sum of its digits. What do you get?
39. 39.7 × 9 =
40. 40.1 + 3 + 5 + … + 13 =

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