Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 784 · 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 + … + 69 =
2. 2.In 3 years a boy will be 12 years old. How old was he 6 years ago?
3. 3.Do the 1089 trick with 860: reverse and subtract, then reverse that answer and add. What do you get?
4. 4.1 × 9 =
5. 5.12345 × 8 + 5 =
6. 6.If today is Wednesday, what day will it be after 81 days? (a) Sunday (b) Saturday (c) Wednesday (d) Monday
7. 7.Do the 1089 trick with 371: reverse and subtract, then reverse that answer and add. What do you get?
8. 8.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
9. 9.Take 168. Reverse its digits and take the smaller number away from the bigger one. What do you get?
10. 10.A father is 32 years old and his son is 12. How old was the father when the son was born?
11. 11.84 × ? = 8400
12. 12.9 × 2 = 1? — what is the missing digit?
13. 13.If today is Wednesday, what day will it be after 21 days? (a) Tuesday (b) Saturday (c) Wednesday (d) Thursday
14. 14.870 × ? = 8700
15. 15.8 × 4 =
16. 16.64?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
17. 17.Magic square (every row, column and diagonal has the same total): 14 12 ? | 24 16 8 | 10 20 18. What is the missing number?
18. 18.Think of 9. Multiply it by 4, then add 7. What number do you end with?
19. 19.37 × 24 =
20. 20.Half of 142 =
21. 21.Do the 1089 trick with 912: reverse and subtract, then reverse that answer and add. What do you get?
22. 22.Double 92 =
23. 23.37 × 15 =
24. 24.6 × 4 =
25. 25.A piggy bank has 8 coins of ₹5 and 5 coins of ₹2. How many rupees are in it?
26. 26.In 2 years a boy will be 10 years old. How old was he 4 years ago?
27. 27.A girl is 8 years old and her brother is 3 years older. How old will her brother be in 2 years?
28. 28.I thought of a number, added 9 and then doubled it. I got 50. What was my number?
29. 29.33 × 4 =
30. 30.What comes next? 1, 2, 4, 8, ? (a) 16 (b) 12 (c) 17 (d) 14
31. 31.717? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
32. 32.Half of 126 =
33. 33.5 × 9 =
34. 34.12345679 × 36 =
35. 35.What comes next? 5, 10, 20, 40, ? (a) 81 (b) 70 (c) 60 (d) 80
36. 36.A father is 43 years old and his son is 7. How old was the father when the son was born?
37. 37.7 × 4 =
38. 38.Take 482. Reverse its digits and take the smaller number away from the bigger one. What do you get?
39. 39.What comes next? 15, 18, 21, 24, ? (a) 30 (b) 24 (c) 28 (d) 27
40. 40.Magic square (every row, column and diagonal has the same total): 29 ? 23 | 14 20 26 | 17 32 11. What is the missing number?

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