Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 125 · 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 + … + 52 =
2. 2.The 4th of a month is a Saturday. What day is the 29th of the same month? (a) Saturday (b) Wednesday (c) Thursday (d) Tuesday
3. 3.9 × 4 =
4. 4.341 × ? = 3410
5. 5.The 8th of a month is a Monday. What day is the 19th of the same month? (a) Monday (b) Thursday (c) Saturday (d) Friday
6. 6.39 × 4 =
7. 7.Magic square (every row, column and diagonal has the same total): 2 7 ? | 9 5 1 | 4 3 8. What is the missing number?
8. 8.3 × 9 =
9. 9.22 × 4 =
10. 10.35 × 4 =
11. 11.31 × 1000 =
12. 12.9 × 3 = 2? — what is the missing digit?
13. 13.9 × 2 = ?8 — what is the missing digit?
14. 14.What comes next? 2, 7, 12, 17, ? (a) 23 (b) 22 (c) 17 (d) 27
15. 15.1 + 2 + 3 + … + 97 =
16. 16.1 + 3 + 5 + … + 13 =
17. 17.24?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
18. 18.21 × 1000 =
19. 19.Take 513. Reverse its digits and take the smaller number away from the bigger one. What do you get?
20. 20.If today is Tuesday, what day was it 28 days ago? (a) Friday (b) Tuesday (c) Wednesday (d) Monday
21. 21.28 × 4 =
22. 22.2?94 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
23. 23.In 6 years a boy will be 15 years old. How old was he 4 years ago?
24. 24.12345678 × 8 + 8 =
25. 25.I thought of a number, added 3 and then doubled it. I got 24. What was my number?
26. 26.2 × 9 =
27. 27.809 × 10 =
28. 28.What comes next? 10, 16, 22, 28, ? (a) 35 (b) 28 (c) 40 (d) 34
29. 29.Magic square (every row, column and diagonal has the same total): 16 31 10 | 13 ? 25 | 28 7 22. What is the missing number?
30. 30.Double 91 =
31. 31.Think of 9. Multiply it by 5, then add 2. What number do you end with?
32. 32.I thought of a number, multiplied it by 3 and added 9. I got 48. What was my number?
33. 33.?205 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
34. 34.Take 46 and take away the sum of its digits. What do you get?
35. 35.55 × 100 =
36. 36.45 × 4 =
37. 37.Magic trick! Think of 2. Double it, add 6, halve it, then take away 2. What number do you get?
38. 38.41 × 4 =
39. 39.A piggy bank has 3 coins of ₹5 and 15 coins of ₹2. How many rupees are in it?
40. 40.74 × ? = 740

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