Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 931 · 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.I thought of a number, multiplied it by 3 and added 9. I got 24. What was my number?
2. 2.Double 79 =
3. 3.9 × 6 =
4. 4.Think of 8. Multiply it by 3, then add 2. What number do you end with?
5. 5.37 × 3 =
6. 6.12345679 × 27 =
7. 7.What comes next? 9, 16, 25, 36, ? (a) 47 (b) 49 (c) 51 (d) 50
8. 8.Take 904. Reverse its digits and take the smaller number away from the bigger one. What do you get?
9. 9.1 + 2 + 3 + … + 12 =
10. 10.49 × 4 =
11. 11.You have 10 coins. Each coin is ₹1 or ₹2, and together they make ₹18. How many ₹2 coins do you have?
12. 12.31 × 4 =
13. 13.The ages of two twins add up to 8. How old is each twin?
14. 14.1 + 2 + 3 + … + 18 =
15. 15.9 × 3 = 2? — what is the missing digit?
16. 16.What comes next? 36, 49, 64, 81, ? (a) 100 (b) 98 (c) 101 (d) 102
17. 17.1 + 2 + 3 + … + 74 =
18. 18.9 × 9 =
19. 19.If today is Wednesday, what day will it be after 44 days? (a) Saturday (b) Friday (c) Thursday (d) Monday
20. 20.What comes next? 5, 10, 20, 40, ? (a) 70 (b) 80 (c) 81 (d) 60
21. 21.9 × 4 = ?6 — what is the missing digit?
22. 22.Do the 1089 trick with 296: reverse and subtract, then reverse that answer and add. What do you get?
23. 23.Take 471. Reverse its digits and take the smaller number away from the bigger one. What do you get?
24. 24.I thought of a number, added 8 and then doubled it. I got 54. What was my number?
25. 25.9 × 7 =
26. 26.Think of 13. Multiply it by 5, then add 1. What number do you end with?
27. 27.Take 117. Reverse its digits and take the smaller number away from the bigger one. What do you get?
28. 28.9 × 6 = ?4 — what is the missing digit?
29. 29.1 + 2 + 3 + … + 17 =
30. 30.If today is Tuesday, what day will it be after 80 days? (a) Monday (b) Friday (c) Thursday (d) Saturday
31. 31.10 × 9 =
32. 32.4 × 9 =
33. 33.Magic trick! Think of 8. Double it, add 4, halve it, then take away 8. What number do you get?
34. 34.The 7th of a month is a Monday. What day is the 18th of the same month? (a) Friday (b) Monday (c) Saturday (d) Thursday
35. 35.36 × 4 =
36. 36.9 × 2 = 1? — what is the missing digit?
37. 37.9 × 8 =
38. 38.1 × 9 =
39. 39.You have 9 coins. Each coin is ₹1 or ₹2, and together they make ₹12. How many ₹2 coins do you have?
40. 40.?380 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

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