Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 108 · 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.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
2. 2.1 + 2 + 3 + … + 6 =
3. 3.1?71 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
4. 4.10 × 9 =
5. 5.What comes next? 5, 10, 20, 40, ? (a) 81 (b) 60 (c) 80 (d) 70
6. 6.A piggy bank has 11 coins of ₹5 and 15 coins of ₹2. How many rupees are in it?
7. 7.Magic trick! Think of 5. Double it, add 14, halve it, then take away 5. What number do you get?
8. 8.9 × 3 = ?7 — what is the missing digit?
9. 9.9 × 4 =
10. 10.9 × 5 = 4? — what is the missing digit?
11. 11.46? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
12. 12.What comes next? 2, 4, 8, 16, ? (a) 32 (b) 24 (c) 28 (d) 33
13. 13.Magic square (every row, column and diagonal has the same total): ? 3 10 | 9 7 5 | 4 11 6. What is the missing number?
14. 14.693 + 396 =
15. 15.A father is 31 years old and his son is 6. How old was the father when the son was born?
16. 16.30 × ? = 3000
17. 17.Do the 1089 trick with 590: reverse and subtract, then reverse that answer and add. What do you get?
18. 18.336 × 10 =
19. 19.A father is 39 years old and his son is 4. How old was the father when the son was born?
20. 20.7 × 9 =
21. 21.Double 31 =
22. 22.2 × 9 =
23. 23.Take 864. Reverse its digits and take the smaller number away from the bigger one. What do you get?
24. 24.9 × 9 =
25. 25.347 × 10 =
26. 26.Take 719. Reverse its digits and take the smaller number away from the bigger one. What do you get?
27. 27.891 + 198 =
28. 28.34 × 4 =
29. 29.40 × 4 =
30. 30.?457 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
31. 31.11 × 11 =
32. 32.Magic square (every row, column and diagonal has the same total): 10 5 12 | 11 9 7 | ? 13 8. What is the missing number?
33. 33.8?06 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
34. 34.The 8th of a month is a Saturday. What day is the 29th of the same month? (a) Tuesday (b) Sunday (c) Saturday (d) Friday
35. 35.Think of 5. Multiply it by 3, then add 1. What number do you end with?
36. 36.9 × 3 = 2? — what is the missing digit?
37. 37.What comes next? 8, 10, 12, 14, ? (a) 18 (b) 14 (c) 16 (d) 17
38. 38.I thought of a number, multiplied it by 5 and added 3. I got 38. What was my number?
39. 39.I thought of a number, added 7 and then doubled it. I got 50. What was my number?
40. 40.A girl is 6 years old and her brother is 2 years older. How old will her brother be in 4 years?

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