Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 224 · 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.Half of 178 =
2. 2.11 × 11 =
3. 3.The 1st of a month is a Saturday. What day is the 21st of the same month? (a) Monday (b) Thursday (c) Friday (d) Saturday
4. 4.9 × 2 =
5. 5.The 4th of a month is a Saturday. What day is the 21st of the same month? (a) Wednesday (b) Monday (c) Tuesday (d) Friday
6. 6.12345 × 9 + 6 =
7. 7.9 × 6 = ?4 — what is the missing digit?
8. 8.18?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
9. 9.Odd one out: which number is NOT in the 5 times table? (a) 37 (b) 25 (c) 30 (d) 10
10. 10.Magic trick! Think of 14. Double it, add 4, halve it, then take away 14. What number do you get?
11. 11.1 + 3 + 5 + … + 29 =
12. 12.10 × 9 =
13. 13.2 × 9 =
14. 14.Take 14 and take away the sum of its digits. What do you get?
15. 15.If today is Wednesday, what day was it 35 days ago? (a) Wednesday (b) Thursday (c) Saturday (d) Tuesday
16. 16.Take 279. Reverse its digits and take the smaller number away from the bigger one. What do you get?
17. 17.What comes next? 10, 15, 20, 25, ? (a) 31 (b) 30 (c) 35 (d) 25
18. 18.The 1st of a month is a Wednesday. What day is the 22nd of the same month? (a) Saturday (b) Wednesday (c) Thursday (d) Tuesday
19. 19.23 × 4 =
20. 20.9 × 8 =
21. 21.20 × 4 =
22. 22.59 × 4 =
23. 23.Take 76 and take away the sum of its digits. What do you get?
24. 24.Half of 142 =
25. 25.10 × 4 =
26. 26.Double 81 =
27. 27.A father is 36 years old and his son is 13. How old was the father when the son was born?
28. 28.Take 592. Reverse its digits and take the smaller number away from the bigger one. What do you get?
29. 29.13? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
30. 30.9 × 8 = 7? — what is the missing digit?
31. 31.1 + 2 + 3 + … + 66 =
32. 32.Magic trick! Think of 4. Double it, add 6, halve it, then take away 4. What number do you get?
33. 33.8 × ? = 8000
34. 34.In 4 years a boy will be 12 years old. How old was he 5 years ago?
35. 35.I thought of a number, added 9 and then doubled it. I got 28. What was my number?
36. 36.1 + 3 + 5 + … + 43 =
37. 37.Take 43 and take away the sum of its digits. What do you get?
38. 38.Magic square (every row, column and diagonal has the same total): 25 10 13 | 4 16 28 | 19 ? 7. What is the missing number?
39. 39.1234567 × 9 + 8 =
40. 40.882 × ? = 8820

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