Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 477 · 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.Double 99 =
2. 2.What comes next? 4, 9, 16, 25, ? (a) 37 (b) 34 (c) 38 (d) 36
3. 3.1 + 2 + 3 + … + 80 =
4. 4.I thought of a number, added 9 and then doubled it. I got 44. What was my number?
5. 5.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
6. 6.If today is Saturday, what day will it be after 30 days? (a) Thursday (b) Sunday (c) Tuesday (d) Monday
7. 7.What comes next? 2, 4, 8, 16, ? (a) 24 (b) 33 (c) 32 (d) 28
8. 8.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
9. 9.2 × 100 =
10. 10.34 × 1000 =
11. 11.56 × 4 =
12. 12.37 × 24 =
13. 13.Magic trick! Think of 2. Double it, add 14, halve it, then take away 2. What number do you get?
14. 14.10 × 4 =
15. 15.15 × 4 =
16. 16.Do the 1089 trick with 920: reverse and subtract, then reverse that answer and add. What do you get?
17. 17.Take 790. Reverse its digits and take the smaller number away from the bigger one. What do you get?
18. 18.6 × 9 =
19. 19.Magic square (every row, column and diagonal has the same total): 10 11 6 | ? 9 13 | 12 7 8. What is the missing number?
20. 20.What comes next? 1, 6, 11, 16, ? (a) 21 (b) 22 (c) 26 (d) 16
21. 21.123456 × 9 + 7 =
22. 22.The 3rd of a month is a Sunday. What day is the 27th of the same month? (a) Tuesday (b) Wednesday (c) Saturday (d) Thursday
23. 23.1 + 2 + 3 + … + 76 =
24. 24.1 + 2 + 3 + … + 56 =
25. 25.I thought of a number, multiplied it by 3 and added 4. I got 16. What was my number?
26. 26.If today is Saturday, what day was it 51 days ago? (a) Thursday (b) Sunday (c) Friday (d) Wednesday
27. 27.Magic trick! Think of 9. Double it, add 8, halve it, then take away 9. What number do you get?
28. 28.What comes next? 9, 16, 25, 36, ? (a) 47 (b) 51 (c) 49 (d) 50
29. 29.89 × 100 =
30. 30.A piggy bank has 5 coins of ₹5 and 10 coins of ₹2. How many rupees are in it?
31. 31.Half of 134 =
32. 32.8 × 9 =
33. 33.9 × 10 = ?0 — what is the missing digit?
34. 34.Magic square (every row, column and diagonal has the same total): 24 27 12 | 9 ? 33 | 30 15 18. What is the missing number?
35. 35.36 × 1000 =
36. 36.9 × 4 =
37. 37.111 × 111 =
38. 38.Magic square (every row, column and diagonal has the same total): 13 34 19 | 28 ? 16 | 25 10 31. What is the missing number?
39. 39.12345679 × 36 =
40. 40.37 × 27 =

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