Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 994 · 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. 1.17 × 1000 =
2. 2.7 × 4 =
3. 3.37 × 15 =
4. 4.A father is 31 years old and his son is 6. How old was the father when the son was born?
5. 5.9 × 2 = ?8 — what is the missing digit?
6. 6.If today is Sunday, what day will it be after 15 days? (a) Thursday (b) Tuesday (c) Sunday (d) Monday
7. 7.Magic square (every row, column and diagonal has the same total): 21 11 25 | 23 19 15 | ? 27 17. What is the missing number?
8. 8.28 × 1000 =
9. 9.36 × ? = 36000
10. 10.9 × 6 = ?4 — what is the missing digit?
11. 11.Magic square (every row, column and diagonal has the same total): 29 ? 23 | 14 20 26 | 17 32 11. What is the missing number?
12. 12.You have 5 coins. Each coin is ₹1 or ₹2, and together they make ₹6. How many ₹2 coins do you have?
13. 13.111111 × 111111 =
14. 14.123456 × 9 + 7 =
15. 15.1 + 3 + 5 + … + 39 =
16. 16.Take 22 and take away the sum of its digits. What do you get?
17. 17.9 × 5 = 4? — what is the missing digit?
18. 18.Magic square (every row, column and diagonal has the same total): 26 5 20 | 11 17 23 | ? 29 8. What is the missing number?
19. 19.1234567 × 9 + 8 =
20. 20.If today is Sunday, what day will it be after 55 days? (a) Saturday (b) Sunday (c) Friday (d) Tuesday
21. 21.9 × 8 = ?2 — what is the missing digit?
22. 22.24 × 4 =
23. 23.3 × 9 =
24. 24.I thought of a number, added 3 and then doubled it. I got 14. What was my number?
25. 25.9 × 4 =
26. 26.9 × 9 =
27. 27.I thought of a number, multiplied it by 2 and added 8. I got 12. What was my number?
28. 28.9 × 8 = 7? — what is the missing digit?
29. 29.A father is 32 years old and his son is 8. How old was the father when the son was born?
30. 30.Magic square (every row, column and diagonal has the same total): 4 14 12 | 18 ? 2 | 8 6 16. What is the missing number?
31. 31.Take 77 and take away the sum of its digits. What do you get?
32. 32.Do the 1089 trick with 239: reverse and subtract, then reverse that answer and add. What do you get?
33. 33.If today is Thursday, what day was it 28 days ago? (a) Sunday (b) Wednesday (c) Thursday (d) Friday
34. 34.9 × 7 = ?3 — what is the missing digit?
35. 35.Do the 1089 trick with 619: reverse and subtract, then reverse that answer and add. What do you get?
36. 36.Magic square (every row, column and diagonal has the same total): 27 ? 33 | 30 24 18 | 15 36 21. What is the missing number?
37. 37.36 × 4 =
38. 38.12345679 × 18 =
39. 39.Take 769. Reverse its digits and take the smaller number away from the bigger one. What do you get?
40. 40.Half of 196 =

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