Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 271 · 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.Take 73 and take away the sum of its digits. What do you get?
2. 2.12 × 8 + 2 =
3. 3.The 7th of a month is a Wednesday. What day is the 20th of the same month? (a) Wednesday (b) Friday (c) Monday (d) Tuesday
4. 4.Take 22 and take away the sum of its digits. What do you get?
5. 5.6 × 9 =
6. 6.9 × 8 =
7. 7.If today is Monday, what day was it 48 days ago? (a) Friday (b) Tuesday (c) Wednesday (d) Monday
8. 8.If today is Friday, what day will it be after 73 days? (a) Thursday (b) Tuesday (c) Monday (d) Sunday
9. 9.What comes next? 36, 49, 64, 81, ? (a) 100 (b) 101 (c) 98 (d) 102
10. 10.49 × 4 =
11. 11.9 × 5 = ?5 — what is the missing digit?
12. 12.742 × ? = 7420
13. 13.35 × ? = 35000
14. 14.A piggy bank has 4 coins of ₹5 and 5 coins of ₹2. How many rupees are in it?
15. 15.Magic square (every row, column and diagonal has the same total): 15 5 ? | 17 13 9 | 7 21 11. What is the missing number?
16. 16.8 × 4 =
17. 17.47 × 4 =
18. 18.58 × 4 =
19. 19.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
20. 20.9 × 2 =
21. 21.Magic square (every row, column and diagonal has the same total): 10 8 18 | 20 ? 4 | 6 16 14. What is the missing number?
22. 22.If today is Saturday, what day will it be after 25 days? (a) Wednesday (b) Tuesday (c) Saturday (d) Thursday
23. 23.Do the 1089 trick with 933: reverse and subtract, then reverse that answer and add. What do you get?
24. 24.What comes next? 5, 10, 20, 40, ? (a) 60 (b) 81 (c) 80 (d) 70
25. 25.29 × 4 =
26. 26.Magic trick! Think of 6. Double it, add 4, halve it, then take away 6. What number do you get?
27. 27.Double 47 =
28. 28.396 + 693 =
29. 29.The ages of two twins add up to 8. How old is each twin?
30. 30.I thought of a number, multiplied it by 2 and added 2. I got 28. What was my number?
31. 31.1 + 3 + 5 + … + 19 =
32. 32.Double 61 =
33. 33.Double 26 =
34. 34.What comes next? 25, 36, 49, 64, ? (a) 83 (b) 79 (c) 82 (d) 81
35. 35.10 × 9 =
36. 36.If today is Sunday, what day will it be after 72 days? (a) Monday (b) Wednesday (c) Friday (d) Tuesday
37. 37.I thought of a number, multiplied it by 5 and added 2. I got 47. What was my number?
38. 38.9 × 2 = ?8 — what is the missing digit?
39. 39.12345679 × 27 =
40. 40.37 × 12 =

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