Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 702 · 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.In 2 years a boy will be 16 years old. How old was he 6 years ago?
2. 2.Take 81 and take away the sum of its digits. What do you get?
3. 3.9 × 5 = ?5 — what is the missing digit?
4. 4.A father is 30 years old and his son is 4. How old was the father when the son was born?
5. 5.9 × 9 =
6. 6.48 × 4 =
7. 7.9 × 10 = ?0 — what is the missing digit?
8. 8.Take 28 and take away the sum of its digits. What do you get?
9. 9.12345679 × 45 =
10. 10.Take 800. Reverse its digits and take the smaller number away from the bigger one. What do you get?
11. 11.Magic trick! Think of 16. Double it, add 18, halve it, then take away 16. What number do you get?
12. 12.111 × 111 =
13. 13.9 × 2 = ?8 — what is the missing digit?
14. 14.9 × 9 = ?1 — what is the missing digit?
15. 15.9 × 2 =
16. 16.14 × 4 =
17. 17.If today is Monday, what day will it be after 67 days? (a) Thursday (b) Monday (c) Saturday (d) Friday
18. 18.1 + 3 + 5 + … + 25 =
19. 19.Magic square (every row, column and diagonal has the same total): 24 3 18 | 9 15 21 | 12 ? 6. What is the missing number?
20. 20.44?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
21. 21.What comes next? 1, 2, 4, 8, ? (a) 12 (b) 17 (c) 16 (d) 14
22. 22.1 + 2 + 3 + … + 97 =
23. 23.?421 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
24. 24.What comes next? 2, 4, 8, 16, ? (a) 32 (b) 28 (c) 33 (d) 24
25. 25.The 4th of a month is a Sunday. What day is the 23rd of the same month? (a) Monday (b) Friday (c) Thursday (d) Saturday
26. 26.37 × 21 =
27. 27.A father is 34 years old and his son is 10. How old was the father when the son was born?
28. 28.If today is Saturday, what day will it be after 96 days? (a) Sunday (b) Friday (c) Wednesday (d) Thursday
29. 29.12345679 × 36 =
30. 30.1 + 2 + 3 + … + 79 =
31. 31.1 + 2 + 3 + … + 89 =
32. 32.I thought of a number, added 1 and then doubled it. I got 40. What was my number?
33. 33.Magic square (every row, column and diagonal has the same total): 4 ? 12 | 18 10 2 | 8 6 16. What is the missing number?
34. 34.Double 14 =
35. 35.Magic square (every row, column and diagonal has the same total): 20 22 12 | ? 18 26 | 24 14 16. What is the missing number?
36. 36.What comes next? 16, 25, 36, 49, ? (a) 62 (b) 66 (c) 64 (d) 65
37. 37.59 × 4 =
38. 38.I thought of a number, multiplied it by 2 and added 4. I got 18. What was my number?
39. 39.3 × 9 =
40. 40.32 × 4 =

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