Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 54 · 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. 1.12345679 × 45 =
2. 2.I thought of a number, multiplied it by 3 and added 3. I got 30. What was my number?
3. 3.56 × 100 =
4. 4.985 × ? = 9850
5. 5.9 × 9 = ?1 — what is the missing digit?
6. 6.The 4th of a month is a Saturday. What day is the 20th of the same month? (a) Sunday (b) Thursday (c) Monday (d) Tuesday
7. 7.9 × 10 = 9? — what is the missing digit?
8. 8.Magic trick! Think of 2. Double it, add 6, halve it, then take away 2. What number do you get?
9. 9.9 × 5 =
10. 10.Half of 142 =
11. 11.A girl is 9 years old and her brother is 5 years older. How old will her brother be in 6 years?
12. 12.297 + 792 =
13. 13.2 × 9 =
14. 14.Magic trick! Think of 2. Double it, add 16, halve it, then take away 2. What number do you get?
15. 15.Take 83 and take away the sum of its digits. What do you get?
16. 16.10 × 9 =
17. 17.Take 106. Reverse its digits and take the smaller number away from the bigger one. What do you get?
18. 18.A girl is 8 years old and her brother is 3 years older. How old will her brother be in 6 years?
19. 19.11111 × 11111 =
20. 20.1?13 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
21. 21.Magic trick! Think of 18. Double it, add 10, halve it, then take away 18. What number do you get?
22. 22.I thought of a number, multiplied it by 4 and added 3. I got 51. What was my number?
23. 23.Think of 15. Multiply it by 4, then add 2. What number do you end with?
24. 24.Take 13 and take away the sum of its digits. What do you get?
25. 25.The 4th of a month is a Tuesday. What day is the 25th of the same month? (a) Tuesday (b) Monday (c) Friday (d) Wednesday
26. 26.What comes next? 2, 6, 10, 14, ? (a) 14 (b) 19 (c) 22 (d) 18
27. 27.1 + 3 + 5 + … + 15 =
28. 28.Magic square (every row, column and diagonal has the same total): ? 9 12 | 3 15 27 | 18 21 6. What is the missing number?
29. 29.1 + 2 + 3 + … + 95 =
30. 30.111111 × 111111 =
31. 31.What comes next? 3, 6, 12, 24, ? (a) 49 (b) 42 (c) 48 (d) 36
32. 32.495 × 10 =
33. 33.23 × 4 =
34. 34.123456 × 9 + 7 =
35. 35.12345679 × 36 =
36. 36.Take 32 and take away the sum of its digits. What do you get?
37. 37.What comes next? 12, 18, 24, 30, ? (a) 37 (b) 42 (c) 30 (d) 36
38. 38.49 × 4 =
39. 39.3 × 9 =
40. 40.Take 518. Reverse its digits and take the smaller number away from the bigger one. What do you get?

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