Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 337 · 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? 16, 25, 36, 49, ? (a) 65 (b) 62 (c) 66 (d) 64
2. 2.If today is Saturday, what day will it be after 36 days? (a) Monday (b) Wednesday (c) Saturday (d) Sunday
3. 3.9 × 2 = 1? — what is the missing digit?
4. 4.9 × 5 = ?5 — what is the missing digit?
5. 5.11 × 11 =
6. 6.9 × 1 =
7. 7.?114 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
8. 8.I thought of a number, added 6 and then doubled it. I got 48. What was my number?
9. 9.What comes next? 2, 4, 8, 16, ? (a) 24 (b) 28 (c) 33 (d) 32
10. 10.1234567 × 8 + 7 =
11. 11.9 × 9 = ?1 — what is the missing digit?
12. 12.Take 950. Reverse its digits and take the smaller number away from the bigger one. What do you get?
13. 13.346 × 10 =
14. 14.7 × 9 =
15. 15.Think of 9. Multiply it by 4, then add 2. What number do you end with?
16. 16.Take 29 and take away the sum of its digits. What do you get?
17. 17.A girl is 7 years old and her brother is 2 years older. How old will her brother be in 3 years?
18. 18.37 × 4 =
19. 19.I thought of a number, multiplied it by 2 and added 7. I got 27. What was my number?
20. 20.4 × 9 =
21. 21.Magic square (every row, column and diagonal has the same total): 21 18 33 | 36 24 12 | 15 30 ?. What is the missing number?
22. 22.The 4th of a month is a Thursday. What day is the 23rd of the same month? (a) Friday (b) Monday (c) Wednesday (d) Tuesday
23. 23.297 + 792 =
24. 24.The 4th of a month is a Friday. What day is the 14th of the same month? (a) Monday (b) Sunday (c) Tuesday (d) Thursday
25. 25.123456 × 8 + 6 =
26. 26.9 × 2 = ?8 — what is the missing digit?
27. 27.669 × 10 =
28. 28.11111 × 11111 =
29. 29.Magic trick! Think of 18. Double it, add 4, halve it, then take away 18. What number do you get?
30. 30.3 × 9 =
31. 31.A girl is 9 years old and her brother is 3 years older. How old will her brother be in 7 years?
32. 32.60 × 4 =
33. 33.12345 × 9 + 6 =
34. 34.Magic trick! Think of 19. Double it, add 16, halve it, then take away 19. What number do you get?
35. 35.5 × 9 =
36. 36.Do the 1089 trick with 730: reverse and subtract, then reverse that answer and add. What do you get?
37. 37.What comes next? 5, 10, 20, 40, ? (a) 80 (b) 70 (c) 81 (d) 60
38. 38.Magic trick! Think of 11. Double it, add 18, halve it, then take away 11. What number do you get?
39. 39.Magic square (every row, column and diagonal has the same total): 8 15 10 | 13 11 9 | 12 7 ?. What is the missing number?
40. 40.If today is Friday, what day will it be after 42 days? (a) Saturday (b) Thursday (c) Friday (d) Monday

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