Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 890 · 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 + … + 52 =
2. 2.183? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
3. 3.I thought of a number, added 4 and then doubled it. I got 46. What was my number?
4. 4.If today is Sunday, what day was it 38 days ago? (a) Wednesday (b) Friday (c) Sunday (d) Thursday
5. 5.12345679 × 36 =
6. 6.You have 12 coins. Each coin is ₹1 or ₹2, and together they make ₹17. How many ₹2 coins do you have?
7. 7.Take 86 and take away the sum of its digits. What do you get?
8. 8.37 × 6 =
9. 9.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
10. 10.Double 72 =
11. 11.Half of 184 =
12. 12.369 × 10 =
13. 13.Take 820. Reverse its digits and take the smaller number away from the bigger one. What do you get?
14. 14.4 × ? = 400
15. 15.10 × 9 =
16. 16.9 × 9 =
17. 17.9 × 2 = 1? — what is the missing digit?
18. 18.37 × 12 =
19. 19.13 × 4 =
20. 20.57 × 4 =
21. 21.I thought of a number, multiplied it by 4 and added 3. I got 27. What was my number?
22. 22.Half of 126 =
23. 23.9 × 5 = ?5 — what is the missing digit?
24. 24.9 × 6 = 5? — what is the missing digit?
25. 25.Magic square (every row, column and diagonal has the same total): 10 ? 8 | 5 7 9 | 6 11 4. What is the missing number?
26. 26.198 + 891 =
27. 27.Magic square (every row, column and diagonal has the same total): 12 2 16 | 14 10 6 | 4 ? 8. What is the missing number?
28. 28.396 + 693 =
29. 29.Double 85 =
30. 30.9 × 4 =
31. 31.607? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
32. 32.1 + 3 + 5 + … + 15 =
33. 33.A girl is 5 years old and her brother is 4 years older. How old will her brother be in 2 years?
34. 34.20 × 100 =
35. 35.Magic square (every row, column and diagonal has the same total): 8 22 12 | 18 14 ? | 16 6 20. What is the missing number?
36. 36.37 × 9 =
37. 37.1 + 2 + 3 + … + 58 =
38. 38.I thought of a number, added 8 and then doubled it. I got 38. What was my number?
39. 39.9 × 3 = 2? — what is the missing digit?
40. 40.What comes next? 13, 17, 21, 25, ? (a) 30 (b) 33 (c) 29 (d) 25

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