Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 91 · 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. 1.1 + 2 + 3 + … + 12 =
2. 2.5 × 9 =
3. 3.905 × ? = 9050
4. 4.Take 26 and take away the sum of its digits. What do you get?
5. 5.Take 810. Reverse its digits and take the smaller number away from the bigger one. What do you get?
6. 6.Magic square (every row, column and diagonal has the same total): 13 23 21 | 27 ? 11 | 17 15 25. What is the missing number?
7. 7.Double 76 =
8. 8.10 × 9 =
9. 9.If today is Friday, what day will it be after 36 days? (a) Sunday (b) Saturday (c) Tuesday (d) Friday
10. 10.The 3rd of a month is a Saturday. What day is the 23rd of the same month? (a) Saturday (b) Friday (c) Monday (d) Thursday
11. 11.The 3rd of a month is a Monday. What day is the 22nd of the same month? (a) Saturday (b) Tuesday (c) Friday (d) Sunday
12. 12.A piggy bank has 7 coins of ₹5 and 13 coins of ₹2. How many rupees are in it?
13. 13.28 × 4 =
14. 14.Double 65 =
15. 15.Take 52 and take away the sum of its digits. What do you get?
16. 16.9 × 5 = 4? — what is the missing digit?
17. 17.If today is Wednesday, what day will it be after 12 days? (a) Tuesday (b) Monday (c) Sunday (d) Thursday
18. 18.872 × ? = 8720
19. 19.What comes next? 2, 4, 8, 16, ? (a) 33 (b) 32 (c) 28 (d) 24
20. 20.27 × 4 =
21. 21.Magic square (every row, column and diagonal has the same total): 16 14 24 | 26 18 10 | 12 22 ?. What is the missing number?
22. 22.Magic square (every row, column and diagonal has the same total): 24 27 12 | 9 21 33 | 30 15 ?. What is the missing number?
23. 23.3 × 9 =
24. 24.Magic trick! Think of 7. Double it, add 6, halve it, then take away 7. What number do you get?
25. 25.1 × 9 =
26. 26.If today is Sunday, what day will it be after 60 days? (a) Thursday (b) Friday (c) Wednesday (d) Sunday
27. 27.9 × 10 = ?0 — what is the missing digit?
28. 28.922 × 10 =
29. 29.Take 14 and take away the sum of its digits. What do you get?
30. 30.14 × 4 =
31. 31.49 × 4 =
32. 32.1 + 2 + 3 + … + 67 =
33. 33.Odd one out: which number is NOT in the 6 times table? (a) 47 (b) 24 (c) 36 (d) 48
34. 34.I thought of a number, multiplied it by 4 and added 1. I got 21. What was my number?
35. 35.Do the 1089 trick with 911: reverse and subtract, then reverse that answer and add. What do you get?
36. 36.1 + 3 + 5 + … + 15 =
37. 37.Magic square (every row, column and diagonal has the same total): 14 15 10 | 9 13 ? | 16 11 12. What is the missing number?
38. 38.9 × 6 = 5? — what is the missing digit?
39. 39.243 × ? = 2430
40. 40.9 × 2 =

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