Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 19 · 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. 1.47 × 100 =
2. 2.Magic square (every row, column and diagonal has the same total): 17 3 13 | 7 11 ? | 9 19 5. What is the missing number?
3. 3.37 × 12 =
4. 4.Take 558. Reverse its digits and take the smaller number away from the bigger one. What do you get?
5. 5.9 × 8 =
6. 6.A girl is 11 years old and her brother is 2 years older. How old will her brother be in 2 years?
7. 7.52 × ? = 520
8. 8.If today is Sunday, what day will it be after 39 days? (a) Friday (b) Thursday (c) Wednesday (d) Sunday
9. 9.Magic square (every row, column and diagonal has the same total): 14 11 26 | 29 17 5 | 8 ? 20. What is the missing number?
10. 10.Odd one out: which number is NOT in the 9 times table? (a) 54 (b) 36 (c) 81 (d) 49
11. 11.If today is Sunday, what day was it 57 days ago? (a) Sunday (b) Tuesday (c) Saturday (d) Friday
12. 12.Double 12 =
13. 13.9 × 9 = ?1 — what is the missing digit?
14. 14.9 × 5 = 4? — what is the missing digit?
15. 15.If today is Thursday, what day will it be after 66 days? (a) Sunday (b) Saturday (c) Wednesday (d) Monday
16. 16.Do the 1089 trick with 980: reverse and subtract, then reverse that answer and add. What do you get?
17. 17.Do the 1089 trick with 871: reverse and subtract, then reverse that answer and add. What do you get?
18. 18.What comes next? 12, 15, 18, 21, ? (a) 25 (b) 21 (c) 27 (d) 24
19. 19.Take 521. Reverse its digits and take the smaller number away from the bigger one. What do you get?
20. 20.Half of 156 =
21. 21.In 6 years a boy will be 14 years old. How old was he 6 years ago?
22. 22.54 × 4 =
23. 23.Half of 106 =
24. 24.10 × 1000 =
25. 25.3 × 9 =
26. 26.198 + 891 =
27. 27.Take 860. Reverse its digits and take the smaller number away from the bigger one. What do you get?
28. 28.2 × 9 =
29. 29.Half of 16 =
30. 30.1 × 9 =
31. 31.11111 × 11111 =
32. 32.What comes next? 1, 2, 4, 8, ? (a) 16 (b) 17 (c) 12 (d) 14
33. 33.Magic square (every row, column and diagonal has the same total): 9 14 13 | ? 12 8 | 11 10 15. What is the missing number?
34. 34.Half of 112 =
35. 35.9 × 10 =
36. 36.12345679 × 81 =
37. 37.1 + 3 + 5 + … + 39 =
38. 38.Think of 3. Multiply it by 2, then add 2. What number do you end with?
39. 39.A piggy bank has 11 coins of ₹5 and 11 coins of ₹2. How many rupees are in it?
40. 40.Take 940. Reverse its digits and take the smaller number away from the bigger one. What do you get?

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