Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 100 · 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.Magic square (every row, column and diagonal has the same total): 17 10 15 | 12 14 ? | 13 18 11. What is the missing number?
2. 2.Do the 1089 trick with 845: reverse and subtract, then reverse that answer and add. What do you get?
3. 3.Double 81 =
4. 4.A girl is 9 years old and her brother is 3 years older. How old will her brother be in 8 years?
5. 5.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
6. 6.A girl is 11 years old and her brother is 5 years older. How old will her brother be in 4 years?
7. 7.9 × 2 = ?8 — what is the missing digit?
8. 8.Take 920. Reverse its digits and take the smaller number away from the bigger one. What do you get?
9. 9.9 × 3 =
10. 10.32 × 100 =
11. 11.Double 53 =
12. 12.If today is Wednesday, what day was it 32 days ago? (a) Friday (b) Tuesday (c) Saturday (d) Sunday
13. 13.9 × 2 = 1? — what is the missing digit?
14. 14.49 × 4 =
15. 15.Double 41 =
16. 16.Think of 11. Multiply it by 3, then add 1. What number do you end with?
17. 17.I thought of a number, added 2 and then doubled it. I got 18. What was my number?
18. 18.Take 810. Reverse its digits and take the smaller number away from the bigger one. What do you get?
19. 19.Magic square (every row, column and diagonal has the same total): 16 18 ? | 6 14 22 | 20 10 12. What is the missing number?
20. 20.9 × 8 = 7? — what is the missing digit?
21. 21.A father is 42 years old and his son is 5. How old was the father when the son was born?
22. 22.37 × 24 =
23. 23.37 × 6 =
24. 24.10 × 9 =
25. 25.Half of 112 =
26. 26.You have 8 coins. Each coin is ₹1 or ₹2, and together they make ₹12. How many ₹2 coins do you have?
27. 27.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
28. 28.41 × 4 =
29. 29.Half of 156 =
30. 30.Take 138. Reverse its digits and take the smaller number away from the bigger one. What do you get?
31. 31.Magic square (every row, column and diagonal has the same total): 14 7 12 | 9 11 13 | ? 15 8. What is the missing number?
32. 32.1 + 3 + 5 + … + 13 =
33. 33.Half of 14 =
34. 34.The ages of two twins add up to 28. How old is each twin?
35. 35.1 + 3 + 5 + … + 31 =
36. 36.4 × 9 =
37. 37.In 3 years a boy will be 16 years old. How old was he 7 years ago?
38. 38.Take 85 and take away the sum of its digits. What do you get?
39. 39.2?22 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
40. 40.9 × 9 = ?1 — what is the missing digit?

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