Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 77 · 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 Saturday, what day will it be after 18 days? (a) Wednesday (b) Saturday (c) Tuesday (d) Thursday
2. 2.42 × 4 =
3. 3.9 × 4 = ?6 — what is the missing digit?
4. 4.9 × 9 =
5. 5.75 × 10 =
6. 6.I thought of a number, multiplied it by 3 and added 6. I got 21. What was my number?
7. 7.The 3rd of a month is a Saturday. What day is the 12th of the same month? (a) Thursday (b) Sunday (c) Tuesday (d) Monday
8. 8.955 × 10 =
9. 9.9 × 10 = ?0 — what is the missing digit?
10. 10.Double 66 =
11. 11.11111 × 11111 =
12. 12.9 × 8 =
13. 13.15 × 4 =
14. 14.99 × ? = 9900
15. 15.111 × 111 =
16. 16.17 × 4 =
17. 17.Magic square (every row, column and diagonal has the same total): 21 36 15 | ? 24 30 | 33 12 27. What is the missing number?
18. 18.1?31 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
19. 19.Magic trick! Think of 3. Double it, add 6, halve it, then take away 3. What number do you get?
20. 20.A girl is 12 years old and her brother is 3 years older. How old will her brother be in 9 years?
21. 21.9 × 2 = ?8 — what is the missing digit?
22. 22.37 × 21 =
23. 23.36 × 4 =
24. 24.I thought of a number, multiplied it by 5 and added 6. I got 71. What was my number?
25. 25.1 + 2 + 3 + … + 7 =
26. 26.Take 62 and take away the sum of its digits. What do you get?
27. 27.9 × 8 = 7? — what is the missing digit?
28. 28.1 + 3 + 5 + … + 13 =
29. 29.Magic trick! Think of 14. Double it, add 12, halve it, then take away 14. What number do you get?
30. 30.12345679 × 27 =
31. 31.47 × 4 =
32. 32.I thought of a number, added 2 and then doubled it. I got 26. What was my number?
33. 33.A father is 30 years old and his son is 13. How old was the father when the son was born?
34. 34.3 × 9 =
35. 35.23 × 4 =
36. 36.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
37. 37.Magic square (every row, column and diagonal has the same total): ? 8 15 | 14 12 10 | 9 16 11. What is the missing number?
38. 38.1 + 3 + 5 + … + 37 =
39. 39.57 × 4 =
40. 40.You have 14 coins. Each coin is ₹1 or ₹2, and together they make ₹25. How many ₹2 coins do you have?

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