Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 685 · 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. 1.3 × 9 =
2. 2.40 × 1000 =
3. 3.95 × 100 =
4. 4.308? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
5. 5.What comes next? 3, 9, 15, 21, ? (a) 21 (b) 28 (c) 33 (d) 27
6. 6.1 + 3 + 5 + … + 25 =
7. 7.9 × 7 = ?3 — what is the missing digit?
8. 8.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
9. 9.I thought of a number, multiplied it by 2 and added 1. I got 29. What was my number?
10. 10.Do the 1089 trick with 990: reverse and subtract, then reverse that answer and add. What do you get?
11. 11.If today is Sunday, what day will it be after 66 days? (a) Saturday (b) Thursday (c) Tuesday (d) Wednesday
12. 12.I thought of a number, added 9 and then doubled it. I got 56. What was my number?
13. 13.88 × 100 =
14. 14.What comes next? 16, 25, 36, 49, ? (a) 65 (b) 64 (c) 66 (d) 62
15. 15.9 × 4 = ?6 — what is the missing digit?
16. 16.69 × ? = 6900
17. 17.37 × 12 =
18. 18.202 × 10 =
19. 19.60 × 4 =
20. 20.A piggy bank has 6 coins of ₹5 and 7 coins of ₹2. How many rupees are in it?
21. 21.I thought of a number, added 9 and then doubled it. I got 58. What was my number?
22. 22.If today is Tuesday, what day will it be after 98 days? (a) Wednesday (b) Tuesday (c) Monday (d) Friday
23. 23.9 × 10 =
24. 24.15 × 4 =
25. 25.9 × 10 = 9? — what is the missing digit?
26. 26.Take 52 and take away the sum of its digits. What do you get?
27. 27.9 × 2 = ?8 — what is the missing digit?
28. 28.What comes next? 3, 6, 12, 24, ? (a) 49 (b) 48 (c) 36 (d) 42
29. 29.Magic square (every row, column and diagonal has the same total): 11 ? 19 | 25 17 9 | 15 13 23. What is the missing number?
30. 30.792 + 297 =
31. 31.Magic trick! Think of 9. Double it, add 4, halve it, then take away 9. What number do you get?
32. 32.If today is Tuesday, what day was it 21 days ago? (a) Monday (b) Tuesday (c) Wednesday (d) Friday
33. 33.The ages of two twins add up to 22. How old is each twin?
34. 34.Half of 12 =
35. 35.91 × 10 =
36. 36.Take 137. Reverse its digits and take the smaller number away from the bigger one. What do you get?
37. 37.9 × 9 =
38. 38.21 × 4 =
39. 39.Take 109. Reverse its digits and take the smaller number away from the bigger one. What do you get?
40. 40.Do the 1089 trick with 900: reverse and subtract, then reverse that answer and add. What do you get?

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