Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 939 · 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.Do the 1089 trick with 854: reverse and subtract, then reverse that answer and add. What do you get?
2. 2.291 × ? = 2910
3. 3.If today is Tuesday, what day was it 46 days ago? (a) Monday (b) Thursday (c) Saturday (d) Friday
4. 4.Take 920. Reverse its digits and take the smaller number away from the bigger one. What do you get?
5. 5.Take 810. Reverse its digits and take the smaller number away from the bigger one. What do you get?
6. 6.15 × 100 =
7. 7.I thought of a number, multiplied it by 2 and added 5. I got 27. What was my number?
8. 8.Do the 1089 trick with 921: reverse and subtract, then reverse that answer and add. What do you get?
9. 9.24 × 4 =
10. 10.Magic square (every row, column and diagonal has the same total): 5 19 9 | 15 11 7 | 13 3 ?. What is the missing number?
11. 11.1 + 2 + 3 + … + 25 =
12. 12.The 7th of a month is a Monday. What day is the 25th of the same month? (a) Monday (b) Friday (c) Thursday (d) Saturday
13. 13.If today is Monday, what day will it be after 45 days? (a) Sunday (b) Thursday (c) Wednesday (d) Friday
14. 14.What comes next? 19, 27, 35, 43, ? (a) 43 (b) 51 (c) 59 (d) 52
15. 15.Think of 10. Multiply it by 3, then add 8. What number do you end with?
16. 16.495 + 594 =
17. 17.If today is Friday, what day will it be after 44 days? (a) Monday (b) Saturday (c) Sunday (d) Wednesday
18. 18.198 + 891 =
19. 19.9 × 7 = ?3 — what is the missing digit?
20. 20.66 × 100 =
21. 21.326? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
22. 22.42 × 100 =
23. 23.I thought of a number, added 6 and then doubled it. I got 24. What was my number?
24. 24.1 + 3 + 5 + … + 31 =
25. 25.4 × 1000 =
26. 26.Think of 5. Multiply it by 4, then add 5. What number do you end with?
27. 27.You have 11 coins. Each coin is ₹1 or ₹2, and together they make ₹14. How many ₹2 coins do you have?
28. 28.If today is Wednesday, what day will it be after 94 days? (a) Tuesday (b) Sunday (c) Saturday (d) Friday
29. 29.I thought of a number, multiplied it by 5 and added 7. I got 47. What was my number?
30. 30.A father is 39 years old and his son is 10. How old was the father when the son was born?
31. 31.Take 330. Reverse its digits and take the smaller number away from the bigger one. What do you get?
32. 32.What comes next? 4, 9, 16, 25, ? (a) 36 (b) 37 (c) 34 (d) 38
33. 33.Magic square (every row, column and diagonal has the same total): 13 15 5 | ? 11 19 | 17 7 9. What is the missing number?
34. 34.52 × 4 =
35. 35.Half of 96 =
36. 36.1 + 3 + 5 + … + 17 =
37. 37.111 × 111 =
38. 38.You have 9 coins. Each coin is ₹1 or ₹2, and together they make ₹12. How many ₹2 coins do you have?
39. 39.31 × 4 =
40. 40.Half of 134 =

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