Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 351 · 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.If today is Wednesday, what day will it be after 42 days? (a) Wednesday (b) Tuesday (c) Thursday (d) Saturday
2. 2.Take 79 and take away the sum of its digits. What do you get?
3. 3.763 × 10 =
4. 4.9 × 9 =
5. 5.44 × 1000 =
6. 6.9 × 4 =
7. 7.Think of 4. Multiply it by 3, then add 6. What number do you end with?
8. 8.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
9. 9.37 × 15 =
10. 10.9 × 8 = ?2 — what is the missing digit?
11. 11.9 × 2 =
12. 12.1 + 3 + 5 + … + 9 =
13. 13.Think of 5. Multiply it by 3, then add 8. What number do you end with?
14. 14.I thought of a number, multiplied it by 5 and added 4. I got 39. What was my number?
15. 15.6 × 4 =
16. 16.1 + 2 + 3 + … + 26 =
17. 17.16 × ? = 16000
18. 18.9 × 3 = ?7 — what is the missing digit?
19. 19.Double 51 =
20. 20.Do the 1089 trick with 782: reverse and subtract, then reverse that answer and add. What do you get?
21. 21.12345679 × 54 =
22. 22.1 + 2 + 3 + … + 58 =
23. 23.Half of 182 =
24. 24.Half of 194 =
25. 25.12?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
26. 26.Double 91 =
27. 27.30 × 4 =
28. 28.Magic trick! Think of 13. Double it, add 6, halve it, then take away 13. What number do you get?
29. 29.A girl is 5 years old and her brother is 6 years older. How old will her brother be in 2 years?
30. 30.If today is Sunday, what day will it be after 66 days? (a) Thursday (b) Saturday (c) Wednesday (d) Tuesday
31. 31.Take 86 and take away the sum of its digits. What do you get?
32. 32.Double 26 =
33. 33.I thought of a number, added 1 and then doubled it. I got 18. What was my number?
34. 34.13 × 4 =
35. 35.What comes next? 14, 18, 22, 26, ? (a) 31 (b) 30 (c) 34 (d) 26
36. 36.What comes next? 5, 10, 20, 40, ? (a) 70 (b) 81 (c) 60 (d) 80
37. 37.The 5th of a month is a Tuesday. What day is the 30th of the same month? (a) Friday (b) Sunday (c) Saturday (d) Tuesday
38. 38.Half of 196 =
39. 39.A piggy bank has 12 coins of ₹5 and 7 coins of ₹2. How many rupees are in it?
40. 40.1 + 3 + 5 + … + 25 =

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