Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 698 · 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. 1.6 × 9 =
2. 2.1 + 3 + 5 + … + 27 =
3. 3.1 + 3 + 5 + … + 29 =
4. 4.25 × 100 =
5. 5.111111 × 111111 =
6. 6.If today is Monday, what day was it 33 days ago? (a) Thursday (b) Saturday (c) Tuesday (d) Wednesday
7. 7.27?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
8. 8.You have 7 coins. Each coin is ₹1 or ₹2, and together they make ₹11. How many ₹2 coins do you have?
9. 9.Do the 1089 trick with 904: reverse and subtract, then reverse that answer and add. What do you get?
10. 10.?115 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
11. 11.?100 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
12. 12.Take 841. Reverse its digits and take the smaller number away from the bigger one. What do you get?
13. 13.In 2 years a boy will be 11 years old. How old was he 4 years ago?
14. 14.Magic square (every row, column and diagonal has the same total): 31 16 19 | 10 ? 34 | 25 28 13. What is the missing number?
15. 15.Half of 48 =
16. 16.Take 821. Reverse its digits and take the smaller number away from the bigger one. What do you get?
17. 17.122? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
18. 18.1 + 2 + 3 + … + 85 =
19. 19.9 × 9 =
20. 20.1 + 2 + 3 + … + 27 =
21. 21.Magic trick! Think of 16. Double it, add 8, halve it, then take away 16. What number do you get?
22. 22.9 × 8 = 7? — what is the missing digit?
23. 23.Do the 1089 trick with 688: reverse and subtract, then reverse that answer and add. What do you get?
24. 24.Magic square (every row, column and diagonal has the same total): ? 17 12 | 15 13 11 | 14 9 16. What is the missing number?
25. 25.A father is 33 years old and his son is 11. How old was the father when the son was born?
26. 26.Double 13 =
27. 27.1 + 3 + 5 + … + 41 =
28. 28.16 × 4 =
29. 29.Odd one out: which number is NOT in the 9 times table? (a) 28 (b) 36 (c) 45 (d) 72
30. 30.What comes next? 16, 18, 20, 22, ? (a) 24 (b) 25 (c) 26 (d) 22
31. 31.72 × 100 =
32. 32.9 × 9 = ?1 — what is the missing digit?
33. 33.9 × 2 =
34. 34.I thought of a number, added 4 and then doubled it. I got 20. What was my number?
35. 35.What comes next? 1, 2, 4, 8, ? (a) 12 (b) 14 (c) 17 (d) 16
36. 36.12345678 × 8 + 8 =
37. 37.What comes next? 7, 15, 23, 31, ? (a) 40 (b) 47 (c) 31 (d) 39
38. 38.41 × 10 =
39. 39.If today is Friday, what day will it be after 41 days? (a) Wednesday (b) Thursday (c) Sunday (d) Friday
40. 40.123456 × 9 + 7 =

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