Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 212 · 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. 1.10 × 9 =
2. 2.3 × 9 =
3. 3.57 × 4 =
4. 4.Do the 1089 trick with 310: reverse and subtract, then reverse that answer and add. What do you get?
5. 5.5 × ? = 5000
6. 6.1 + 2 + 3 + … + 57 =
7. 7.824 × ? = 8240
8. 8.9 × 10 = 9? — what is the missing digit?
9. 9.23 × 4 =
10. 10.9 × 4 =
11. 11.Think of 12. Multiply it by 2, then add 4. What number do you end with?
12. 12.Think of 13. Multiply it by 3, then add 1. What number do you end with?
13. 13.1 + 3 + 5 + … + 25 =
14. 14.A father is 31 years old and his son is 9. How old was the father when the son was born?
15. 15.611? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
16. 16.The 3rd of a month is a Tuesday. What day is the 28th of the same month? (a) Tuesday (b) Sunday (c) Saturday (d) Friday
17. 17.54 × 4 =
18. 18.9 × 9 =
19. 19.5 × ? = 500
20. 20.1234 × 8 + 4 =
21. 21.You have 8 coins. Each coin is ₹1 or ₹2, and together they make ₹10. How many ₹2 coins do you have?
22. 22.1 + 3 + 5 + … + 35 =
23. 23.In 6 years a boy will be 20 years old. How old was he 5 years ago?
24. 24.1 + 2 + 3 + … + 13 =
25. 25.Double 58 =
26. 26.12345679 × 54 =
27. 27.If today is Friday, what day was it 13 days ago? (a) Saturday (b) Sunday (c) Tuesday (d) Friday
28. 28.Take 901. Reverse its digits and take the smaller number away from the bigger one. What do you get?
29. 29.Do the 1089 trick with 250: reverse and subtract, then reverse that answer and add. What do you get?
30. 30.9 × 4 = ?6 — what is the missing digit?
31. 31.1 + 2 + 3 + … + 90 =
32. 32.I thought of a number, multiplied it by 5 and added 3. I got 18. What was my number?
33. 33.The ages of two twins add up to 16. How old is each twin?
34. 34.The ages of two twins add up to 12. How old is each twin?
35. 35.If today is Thursday, what day was it 25 days ago? (a) Saturday (b) Sunday (c) Monday (d) Wednesday
36. 36.A girl is 9 years old and her brother is 2 years older. How old will her brother be in 7 years?
37. 37.Double 13 =
38. 38.1 + 2 + 3 + … + 6 =
39. 39.If today is Sunday, what day was it 19 days ago? (a) Friday (b) Wednesday (c) Tuesday (d) Monday
40. 40.Half of 176 =

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