Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 273 · 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. 1.2?77 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
2. 2.Take 20 and take away the sum of its digits. What do you get?
3. 3.Magic square (every row, column and diagonal has the same total): ? 18 13 | 16 14 12 | 15 10 17. What is the missing number?
4. 4.You have 14 coins. Each coin is ₹1 or ₹2, and together they make ₹17. How many ₹2 coins do you have?
5. 5.Magic square (every row, column and diagonal has the same total): 29 ? 17 | 8 20 32 | 23 26 11. What is the missing number?
6. 6.The 6th of a month is a Sunday. What day is the 24th of the same month? (a) Sunday (b) Wednesday (c) Friday (d) Thursday
7. 7.Magic square (every row, column and diagonal has the same total): 10 11 6 | ? 9 13 | 12 7 8. What is the missing number?
8. 8.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
9. 9.111 × 111 =
10. 10.32 × 100 =
11. 11.What comes next? 5, 10, 20, 40, ? (a) 81 (b) 70 (c) 60 (d) 80
12. 12.34 × 1000 =
13. 13.9 × 8 = 7? — what is the missing digit?
14. 14.9 × 3 = 2? — what is the missing digit?
15. 15.58 × 4 =
16. 16.37 × 12 =
17. 17.9 × 7 = ?3 — what is the missing digit?
18. 18.1 + 2 + 3 + … + 13 =
19. 19.Think of 10. Multiply it by 5, then add 9. What number do you end with?
20. 20.1 + 2 + 3 + … + 90 =
21. 21.5 × 9 =
22. 22.10 × 9 =
23. 23.What comes next? 13, 22, 31, 40, ? (a) 40 (b) 50 (c) 49 (d) 58
24. 24.Magic square (every row, column and diagonal has the same total): 24 9 30 | ? 21 15 | 12 33 18. What is the missing number?
25. 25.9 × 10 = 9? — what is the missing digit?
26. 26.Double 21 =
27. 27.4 × 9 =
28. 28.Magic square (every row, column and diagonal has the same total): 28 ? 22 | 13 19 25 | 16 31 10. What is the missing number?
29. 29.57 × 100 =
30. 30.If today is Tuesday, what day will it be after 45 days? (a) Friday (b) Saturday (c) Thursday (d) Monday
31. 31.1 + 3 + 5 + … + 43 =
32. 32.24 × ? = 2400
33. 33.Take 99 and take away the sum of its digits. What do you get?
34. 34.What comes next? 20, 25, 30, 35, ? (a) 40 (b) 35 (c) 41 (d) 45
35. 35.17 × 1000 =
36. 36.Double 76 =
37. 37.34 × 4 =
38. 38.9 × 6 = ?4 — what is the missing digit?
39. 39.9 × 10 =
40. 40.105 × 10 =

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