Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 380 · 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. 1.54 × 4 =
2. 2.59 × 4 =
3. 3.In 4 years a boy will be 17 years old. How old was he 2 years ago?
4. 4.9 × 3 = ?7 — what is the missing digit?
5. 5.Double 72 =
6. 6.60 × 4 =
7. 7.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
8. 8.Half of 192 =
9. 9.If today is Monday, what day will it be after 43 days? (a) Friday (b) Tuesday (c) Wednesday (d) Monday
10. 10.111111 × 111111 =
11. 11.1 + 2 + 3 + … + 75 =
12. 12.Take 720. Reverse its digits and take the smaller number away from the bigger one. What do you get?
13. 13.Take 91 and take away the sum of its digits. What do you get?
14. 14.805? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
15. 15.Double 89 =
16. 16.9 × 7 = 6? — what is the missing digit?
17. 17.21 × 4 =
18. 18.Double 81 =
19. 19.12345 × 8 + 5 =
20. 20.In 5 years a boy will be 13 years old. How old was he 3 years ago?
21. 21.Magic square (every row, column and diagonal has the same total): 9 14 7 | 8 10 12 | 13 6 ?. What is the missing number?
22. 22.9 × 6 =
23. 23.A piggy bank has 11 coins of ₹5 and 3 coins of ₹2. How many rupees are in it?
24. 24.40 × ? = 4000
25. 25.You have 15 coins. Each coin is ₹1 or ₹2, and together they make ₹25. How many ₹2 coins do you have?
26. 26.495 + 594 =
27. 27.9 × 8 =
28. 28.56 × 4 =
29. 29.Take 12 and take away the sum of its digits. What do you get?
30. 30.A father is 40 years old and his son is 11. How old was the father when the son was born?
31. 31.9 × 4 = 3? — what is the missing digit?
32. 32.The 1st of a month is a Sunday. What day is the 27th of the same month? (a) Thursday (b) Saturday (c) Monday (d) Friday
33. 33.11 × ? = 1100
34. 34.Take 48 and take away the sum of its digits. What do you get?
35. 35.I thought of a number, multiplied it by 3 and added 9. I got 48. What was my number?
36. 36.9 × 9 =
37. 37.A girl is 11 years old and her brother is 3 years older. How old will her brother be in 5 years?
38. 38.Double 79 =
39. 39.9 × 8 = ?2 — what is the missing digit?
40. 40.9 × 8 = 7? — what is the missing digit?

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