Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 388 · 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. 1.38 × 100 =
2. 2.Magic trick! Think of 14. Double it, add 14, halve it, then take away 14. What number do you get?
3. 3.346 × ? = 3460
4. 4.9 × 10 = 9? — what is the missing digit?
5. 5.Magic square (every row, column and diagonal has the same total): 16 ? 12 | 14 18 22 | 24 10 20. What is the missing number?
6. 6.I thought of a number, added 5 and then doubled it. I got 28. What was my number?
7. 7.1 + 3 + 5 + … + 13 =
8. 8.Magic square (every row, column and diagonal has the same total): 6 16 14 | 20 12 4 | 10 ? 18. What is the missing number?
9. 9.Half of 102 =
10. 10.12 × 9 + 3 =
11. 11.Magic square (every row, column and diagonal has the same total): 9 ? 11 | 10 8 6 | 5 12 7. What is the missing number?
12. 12.The ages of two twins add up to 26. How old is each twin?
13. 13.Take 812. Reverse its digits and take the smaller number away from the bigger one. What do you get?
14. 14.Magic square (every row, column and diagonal has the same total): 8 3 4 | 1 5 9 | 6 7 ?. What is the missing number?
15. 15.Magic square (every row, column and diagonal has the same total): 14 29 8 | 11 17 ? | 26 5 20. What is the missing number?
16. 16.751 × 10 =
17. 17.1 + 2 + 3 + … + 50 =
18. 18.111111 × 111111 =
19. 19.292 × 10 =
20. 20.If today is Sunday, what day will it be after 21 days? (a) Saturday (b) Wednesday (c) Monday (d) Sunday
21. 21.The ages of two twins add up to 18. How old is each twin?
22. 22.What comes next? 25, 36, 49, 64, ? (a) 81 (b) 82 (c) 83 (d) 79
23. 23.9 × 4 =
24. 24.The 9th of a month is a Monday. What day is the 17th of the same month? (a) Tuesday (b) Monday (c) Wednesday (d) Friday
25. 25.What comes next? 2, 4, 8, 16, ? (a) 24 (b) 32 (c) 33 (d) 28
26. 26.6 × 4 =
27. 27.Double 43 =
28. 28.Magic square (every row, column and diagonal has the same total): 8 6 16 | 18 10 2 | 4 14 ?. What is the missing number?
29. 29.9 × 5 = ?5 — what is the missing digit?
30. 30.1 + 2 + 3 + … + 81 =
31. 31.Double 97 =
32. 32.You have 7 coins. Each coin is ₹1 or ₹2, and together they make ₹8. How many ₹2 coins do you have?
33. 33.43 × 4 =
34. 34.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
35. 35.1 + 2 + 3 + … + 7 =
36. 36.9 × 8 = 7? — what is the missing digit?
37. 37.46 × 4 =
38. 38.A father is 37 years old and his son is 6. How old was the father when the son was born?
39. 39.21 × 4 =
40. 40.Magic square (every row, column and diagonal has the same total): 14 24 10 | 12 16 ? | 22 8 18. What is the missing number?

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