Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 581 · 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.What comes next? 16, 25, 36, 49, ? (a) 64 (b) 65 (c) 66 (d) 62
2. 2.What comes next? 25, 36, 49, 64, ? (a) 81 (b) 79 (c) 82 (d) 83
3. 3.895 × 10 =
4. 4.11 × 4 =
5. 5.59 × 4 =
6. 6.347 × 10 =
7. 7.14 × 4 =
8. 8.Double 77 =
9. 9.12345 × 9 + 6 =
10. 10.1 + 3 + 5 + … + 21 =
11. 11.Magic square (every row, column and diagonal has the same total): 14 35 20 | ? 23 17 | 26 11 32. What is the missing number?
12. 12.58 × 4 =
13. 13.Take 70 and take away the sum of its digits. What do you get?
14. 14.12345679 × 9 =
15. 15.Double 81 =
16. 16.3 × 9 =
17. 17.If today is Friday, what day was it 30 days ago? (a) Tuesday (b) Wednesday (c) Saturday (d) Thursday
18. 18.5 × 9 =
19. 19.What comes next? 3, 6, 12, 24, ? (a) 48 (b) 42 (c) 36 (d) 49
20. 20.30 × 4 =
21. 21.12345679 × 72 =
22. 22.Take 630. Reverse its digits and take the smaller number away from the bigger one. What do you get?
23. 23.69 × 100 =
24. 24.9 × 9 = ?1 — what is the missing digit?
25. 25.10 × 4 =
26. 26.53 × 4 =
27. 27.Do the 1089 trick with 700: reverse and subtract, then reverse that answer and add. What do you get?
28. 28.What comes next? 4, 9, 16, 25, ? (a) 36 (b) 37 (c) 38 (d) 34
29. 29.459 × ? = 4590
30. 30.1 + 3 + 5 + … + 19 =
31. 31.Magic square (every row, column and diagonal has the same total): ? 14 24 | 26 18 10 | 12 22 20. What is the missing number?
32. 32.Magic trick! Think of 3. Double it, add 18, halve it, then take away 3. What number do you get?
33. 33.If today is Wednesday, what day will it be after 76 days? (a) Tuesday (b) Friday (c) Monday (d) Wednesday
34. 34.9 × 9 =
35. 35.Do the 1089 trick with 531: reverse and subtract, then reverse that answer and add. What do you get?
36. 36.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
37. 37.37 × 21 =
38. 38.I thought of a number, added 4 and then doubled it. I got 30. What was my number?
39. 39.9 × 6 =
40. 40.A piggy bank has 12 coins of ₹5 and 12 coins of ₹2. How many rupees are in it?

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