Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 833 · 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. 1.4 × 9 =
2. 2.I thought of a number, multiplied it by 2 and added 8. I got 12. What was my number?
3. 3.9 × 8 =
4. 4.9 × 3 =
5. 5.1 + 3 + 5 + … + 31 =
6. 6.Magic square (every row, column and diagonal has the same total): 4 ? 2 | 3 5 7 | 8 1 6. What is the missing number?
7. 7.What comes next? 5, 10, 20, 40, ? (a) 70 (b) 60 (c) 80 (d) 81
8. 8.3 × 9 =
9. 9.84 × ? = 8400
10. 10.1 + 2 + 3 + … + 8 =
11. 11.Double 83 =
12. 12.Half of 32 =
13. 13.9 × 4 = ?6 — what is the missing digit?
14. 14.9 × 10 = 9? — what is the missing digit?
15. 15.Magic trick! Think of 6. Double it, add 16, halve it, then take away 6. What number do you get?
16. 16.You have 15 coins. Each coin is ₹1 or ₹2, and together they make ₹17. How many ₹2 coins do you have?
17. 17.A father is 32 years old and his son is 13. How old was the father when the son was born?
18. 18.765 × 10 =
19. 19.Magic square (every row, column and diagonal has the same total): 20 17 32 | 35 23 11 | 14 ? 26. What is the missing number?
20. 20.1 + 2 + 3 + … + 29 =
21. 21.A girl is 12 years old and her brother is 4 years older. How old will her brother be in 9 years?
22. 22.574 × 10 =
23. 23.25 × ? = 2500
24. 24.The 5th of a month is a Wednesday. What day is the 14th of the same month? (a) Thursday (b) Monday (c) Saturday (d) Friday
25. 25.9 × 8 = 7? — what is the missing digit?
26. 26.What comes next? 2, 4, 8, 16, ? (a) 33 (b) 24 (c) 28 (d) 32
27. 27.35 × 4 =
28. 28.Double 77 =
29. 29.Half of 118 =
30. 30.13 × 4 =
31. 31.What comes next? 1, 2, 4, 8, ? (a) 16 (b) 14 (c) 12 (d) 17
32. 32.Double 31 =
33. 33.9 × 2 = 1? — what is the missing digit?
34. 34.9 × 10 = ?0 — what is the missing digit?
35. 35.Take 498. Reverse its digits and take the smaller number away from the bigger one. What do you get?
36. 36.Magic square (every row, column and diagonal has the same total): 5 12 7 | 10 8 6 | ? 4 11. What is the missing number?
37. 37.Take 980. Reverse its digits and take the smaller number away from the bigger one. What do you get?
38. 38.What comes next? 3, 6, 12, 24, ? (a) 36 (b) 42 (c) 49 (d) 48
39. 39.46 × 4 =
40. 40.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?

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