Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 355 · 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 5 years a boy will be 17 years old. How old was he 6 years ago?
2. 2.65?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
3. 3.Take 318. Reverse its digits and take the smaller number away from the bigger one. What do you get?
4. 4.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
5. 5.If today is Tuesday, what day will it be after 13 days? (a) Sunday (b) Thursday (c) Tuesday (d) Monday
6. 6.9 × 9 = 8? — what is the missing digit?
7. 7.The 1st of a month is a Saturday. What day is the 21st of the same month? (a) Monday (b) Friday (c) Saturday (d) Thursday
8. 8.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
9. 9.12345679 × 45 =
10. 10.Double 27 =
11. 11.7 × 9 =
12. 12.9 × 9 =
13. 13.123 × 8 + 3 =
14. 14.122 × ? = 1220
15. 15.Take 820. Reverse its digits and take the smaller number away from the bigger one. What do you get?
16. 16.If today is Monday, what day was it 46 days ago? (a) Sunday (b) Thursday (c) Wednesday (d) Friday
17. 17.3 × 9 =
18. 18.11 × 11 =
19. 19.Magic square (every row, column and diagonal has the same total): ? 7 14 | 13 11 9 | 8 15 10. What is the missing number?
20. 20.What comes next? 5, 10, 20, 40, ? (a) 81 (b) 60 (c) 70 (d) 80
21. 21.Double 35 =
22. 22.Magic square (every row, column and diagonal has the same total): 3 10 5 | 8 6 ? | 7 2 9. What is the missing number?
23. 23.1 + 3 + 5 + … + 47 =
24. 24.23 × 4 =
25. 25.9 × 6 =
26. 26.297 + 792 =
27. 27.Take 93 and take away the sum of its digits. What do you get?
28. 28.What comes next? 1, 2, 4, 8, ? (a) 12 (b) 17 (c) 14 (d) 16
29. 29.36 × 4 =
30. 30.A girl is 11 years old and her brother is 6 years older. How old will her brother be in 8 years?
31. 31.I thought of a number, multiplied it by 5 and added 2. I got 77. What was my number?
32. 32.I thought of a number, added 1 and then doubled it. I got 24. What was my number?
33. 33.6 × 1000 =
34. 34.The 4th of a month is a Wednesday. What day is the 13th of the same month? (a) Saturday (b) Monday (c) Thursday (d) Friday
35. 35.Magic square (every row, column and diagonal has the same total): 2 7 6 | 9 5 ? | 4 3 8. What is the missing number?
36. 36.655? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
37. 37.9 × 10 = 9? — what is the missing digit?
38. 38.9 × 3 = 2? — what is the missing digit?
39. 39.4?77 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
40. 40.Take 700. Reverse its digits and take the smaller number away from the bigger one. What do you get?

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