Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 536 · 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. 1.32 × 4 =
2. 2.1 + 2 + 3 + … + 17 =
3. 3.A piggy bank has 9 coins of ₹5 and 14 coins of ₹2. How many rupees are in it?
4. 4.Half of 174 =
5. 5.76 × 100 =
6. 6.If today is Saturday, what day will it be after 9 days? (a) Thursday (b) Monday (c) Tuesday (d) Sunday
7. 7.41 × 4 =
8. 8.44 × 100 =
9. 9.1 + 2 + 3 + … + 27 =
10. 10.?45 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
11. 11.A girl is 5 years old and her brother is 6 years older. How old will her brother be in 8 years?
12. 12.12345679 × 81 =
13. 13.6 × 4 =
14. 14.297 + 792 =
15. 15.A father is 33 years old and his son is 5. How old was the father when the son was born?
16. 16.1 + 2 + 3 + … + 98 =
17. 17.1 + 2 + 3 + … + 8 =
18. 18.A girl is 8 years old and her brother is 5 years older. How old will her brother be in 9 years?
19. 19.Do the 1089 trick with 311: reverse and subtract, then reverse that answer and add. What do you get?
20. 20.9 × 4 = ?6 — what is the missing digit?
21. 21.I thought of a number, multiplied it by 4 and added 4. I got 16. What was my number?
22. 22.The 7th of a month is a Friday. What day is the 22nd of the same month? (a) Sunday (b) Saturday (c) Friday (d) Tuesday
23. 23.87 × 100 =
24. 24.59 × 4 =
25. 25.9 × 10 = ?0 — what is the missing digit?
26. 26.46 × 100 =
27. 27.In 6 years a boy will be 17 years old. How old was he 3 years ago?
28. 28.In 4 years a boy will be 17 years old. How old was he 2 years ago?
29. 29.1 + 3 + 5 + … + 45 =
30. 30.Do the 1089 trick with 420: reverse and subtract, then reverse that answer and add. What do you get?
31. 31.Half of 62 =
32. 32.Magic square (every row, column and diagonal has the same total): 9 23 13 | 19 15 11 | 17 ? 21. What is the missing number?
33. 33.3 × 9 =
34. 34.Do the 1089 trick with 894: reverse and subtract, then reverse that answer and add. What do you get?
35. 35.22 × 1000 =
36. 36.9 × 9 = 8? — what is the missing digit?
37. 37.37 × 4 =
38. 38.Magic square (every row, column and diagonal has the same total): 23 13 15 | 9 17 25 | 19 ? 11. What is the missing number?
39. 39.Take 69 and take away the sum of its digits. What do you get?
40. 40.Half of 54 =

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