Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 486 · 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.The 5th of a month is a Tuesday. What day is the 23rd of the same month? (a) Sunday (b) Tuesday (c) Friday (d) Saturday
2. 2.Magic trick! Think of 6. Double it, add 8, halve it, then take away 6. What number do you get?
3. 3.395 × ? = 3950
4. 4.1 + 2 + 3 + … + 12 =
5. 5.Magic trick! Think of 8. Double it, add 6, halve it, then take away 8. What number do you get?
6. 6.12345 × 8 + 5 =
7. 7.Take 402. Reverse its digits and take the smaller number away from the bigger one. What do you get?
8. 8.Think of 2. Multiply it by 3, then add 7. What number do you end with?
9. 9.12345678 × 9 + 9 =
10. 10.1 + 2 + 3 + … + 48 =
11. 11.Magic square (every row, column and diagonal has the same total): 18 21 6 | 3 15 ? | 24 9 12. What is the missing number?
12. 12.Take 801. Reverse its digits and take the smaller number away from the bigger one. What do you get?
13. 13.A girl is 8 years old and her brother is 4 years older. How old will her brother be in 5 years?
14. 14.What comes next? 11, 16, 21, 26, ? (a) 36 (b) 32 (c) 26 (d) 31
15. 15.Half of 198 =
16. 16.57 × 4 =
17. 17.9 × 5 = ?5 — what is the missing digit?
18. 18.What comes next? 17, 24, 31, 38, ? (a) 38 (b) 46 (c) 45 (d) 52
19. 19.Magic trick! Think of 4. Double it, add 18, halve it, then take away 4. What number do you get?
20. 20.9 × 1 =
21. 21.9 × 6 = 5? — what is the missing digit?
22. 22.7 × 9 =
23. 23.What comes next? 1, 2, 4, 8, ? (a) 14 (b) 12 (c) 17 (d) 16
24. 24.12345679 × 81 =
25. 25.21?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
26. 26.What comes next? 18, 23, 28, 33, ? (a) 43 (b) 39 (c) 33 (d) 38
27. 27.Do the 1089 trick with 399: reverse and subtract, then reverse that answer and add. What do you get?
28. 28.89 × ? = 8900
29. 29.297 + 792 =
30. 30.4?49 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
31. 31.I thought of a number, added 2 and then doubled it. I got 30. What was my number?
32. 32.Take 440. Reverse its digits and take the smaller number away from the bigger one. What do you get?
33. 33.A father is 35 years old and his son is 4. How old was the father when the son was born?
34. 34.If today is Sunday, what day will it be after 27 days? (a) Sunday (b) Saturday (c) Friday (d) Tuesday
35. 35.14 × 4 =
36. 36.Magic square (every row, column and diagonal has the same total): 20 22 ? | 10 18 26 | 24 14 16. What is the missing number?
37. 37.Think of 8. Multiply it by 4, then add 2. What number do you end with?
38. 38.Magic square (every row, column and diagonal has the same total): 16 9 14 | 11 13 15 | 12 17 ?. What is the missing number?
39. 39.Magic square (every row, column and diagonal has the same total): 13 12 17 | ? 14 10 | 11 16 15. What is the missing number?
40. 40.What comes next? 1, 4, 9, 16, ? (a) 26 (b) 27 (c) 25 (d) 23

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