Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 638 · 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. 1.11 × 11 =
2. 2.A piggy bank has 10 coins of ₹5 and 14 coins of ₹2. How many rupees are in it?
3. 3.What comes next? 25, 36, 49, 64, ? (a) 82 (b) 79 (c) 83 (d) 81
4. 4.12345679 × 54 =
5. 5.Double 83 =
6. 6.520 × 10 =
7. 7.Magic trick! Think of 6. Double it, add 16, halve it, then take away 6. What number do you get?
8. 8.A girl is 10 years old and her brother is 6 years older. How old will her brother be in 3 years?
9. 9.37 × 21 =
10. 10.39 × 4 =
11. 11.I thought of a number, added 2 and then doubled it. I got 24. What was my number?
12. 12.If today is Sunday, what day will it be after 46 days? (a) Thursday (b) Friday (c) Sunday (d) Wednesday
13. 13.What comes next? 5, 10, 20, 40, ? (a) 70 (b) 81 (c) 80 (d) 60
14. 14.Magic trick! Think of 20. Double it, add 14, halve it, then take away 20. What number do you get?
15. 15.9 × 2 =
16. 16.The 8th of a month is a Tuesday. What day is the 28th of the same month? (a) Thursday (b) Sunday (c) Monday (d) Tuesday
17. 17.9 × 9 =
18. 18.1 + 2 + 3 + … + 6 =
19. 19.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
20. 20.29 × 4 =
21. 21.Do the 1089 trick with 508: reverse and subtract, then reverse that answer and add. What do you get?
22. 22.I thought of a number, added 1 and then doubled it. I got 16. What was my number?
23. 23.16 × 4 =
24. 24.1 + 3 + 5 + … + 13 =
25. 25.If today is Friday, what day will it be after 50 days? (a) Saturday (b) Friday (c) Tuesday (d) Sunday
26. 26.Double 48 =
27. 27.49 × 1000 =
28. 28.Take 538. Reverse its digits and take the smaller number away from the bigger one. What do you get?
29. 29.Double 22 =
30. 30.What comes next? 6, 12, 18, 24, ? (a) 31 (b) 36 (c) 24 (d) 30
31. 31.9 × 5 = ?5 — what is the missing digit?
32. 32.?42 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
33. 33.What comes next? 6, 9, 12, 15, ? (a) 18 (b) 19 (c) 15 (d) 21
34. 34.I thought of a number, added 4 and then doubled it. I got 14. What was my number?
35. 35.What comes next? 20, 22, 24, 26, ? (a) 28 (b) 26 (c) 30 (d) 29
36. 36.If today is Sunday, what day was it 46 days ago? (a) Tuesday (b) Thursday (c) Saturday (d) Wednesday
37. 37.123456 × 9 + 7 =
38. 38.9 × 1 =
39. 39.?221 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
40. 40.If today is Saturday, what day will it be after 42 days? (a) Friday (b) Saturday (c) Tuesday (d) Sunday

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