Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 686 · 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.The 8th of a month is a Saturday. What day is the 27th of the same month? (a) Friday (b) Sunday (c) Thursday (d) Wednesday
2. 2.1 + 2 + 3 + … + 11 =
3. 3.Do the 1089 trick with 439: reverse and subtract, then reverse that answer and add. What do you get?
4. 4.9 × 4 = ?6 — what is the missing digit?
5. 5.Take 540. Reverse its digits and take the smaller number away from the bigger one. What do you get?
6. 6.1234567 × 8 + 7 =
7. 7.408? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
8. 8.I thought of a number, added 1 and then doubled it. I got 8. What was my number?
9. 9.43 × 1000 =
10. 10.37 × 6 =
11. 11.Magic trick! Think of 19. Double it, add 16, halve it, then take away 19. What number do you get?
12. 12.29 × 1000 =
13. 13.What comes next? 7, 13, 19, 25, ? (a) 37 (b) 31 (c) 25 (d) 32
14. 14.Take 940. Reverse its digits and take the smaller number away from the bigger one. What do you get?
15. 15.19 × 4 =
16. 16.What comes next? 5, 10, 20, 40, ? (a) 81 (b) 80 (c) 60 (d) 70
17. 17.1 + 3 + 5 + … + 29 =
18. 18.If today is Thursday, what day will it be after 90 days? (a) Tuesday (b) Wednesday (c) Thursday (d) Saturday
19. 19.1 + 2 + 3 + … + 44 =
20. 20.297 + 792 =
21. 21.A girl is 5 years old and her brother is 4 years older. How old will her brother be in 9 years?
22. 22.If today is Monday, what day was it 27 days ago? (a) Wednesday (b) Tuesday (c) Friday (d) Monday
23. 23.A piggy bank has 5 coins of ₹5 and 13 coins of ₹2. How many rupees are in it?
24. 24.A father is 34 years old and his son is 10. How old was the father when the son was born?
25. 25.Magic square (every row, column and diagonal has the same total): 23 8 29 | 26 20 ? | 11 32 17. What is the missing number?
26. 26.A father is 40 years old and his son is 10. How old was the father when the son was born?
27. 27.12345678 × 9 + 9 =
28. 28.Magic square (every row, column and diagonal has the same total): 14 12 22 | 24 16 8 | 10 ? 18. What is the missing number?
29. 29.55 × 4 =
30. 30.1 + 3 + 5 + … + 39 =
31. 31.6 × 4 =
32. 32.Do the 1089 trick with 698: reverse and subtract, then reverse that answer and add. What do you get?
33. 33.1 + 2 + 3 + … + 88 =
34. 34.123456 × 9 + 7 =
35. 35.Magic square (every row, column and diagonal has the same total): 18 4 14 | 8 12 16 | 10 ? 6. What is the missing number?
36. 36.Take 90 and take away the sum of its digits. What do you get?
37. 37.1 + 2 + 3 + … + 98 =
38. 38.If today is Tuesday, what day was it 24 days ago? (a) Friday (b) Saturday (c) Tuesday (d) Sunday
39. 39.11111 × 11111 =
40. 40.A girl is 6 years old and her brother is 5 years older. How old will her brother be in 6 years?

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