Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 218 · 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. 2.450 × ? = 4500
3. 3.1 + 2 + 3 + … + 75 =
4. 4.A piggy bank has 7 coins of ₹5 and 5 coins of ₹2. How many rupees are in it?
5. 5.17 × 4 =
6. 6.I thought of a number, multiplied it by 4 and added 6. I got 26. What was my number?
7. 7.835 × 10 =
8. 8.12345679 × 54 =
9. 9.Double 21 =
10. 10.If today is Sunday, what day will it be after 67 days? (a) Wednesday (b) Thursday (c) Friday (d) Sunday
11. 11.1 + 2 + 3 + … + 66 =
12. 12.9 × 2 =
13. 13.9 × 2 = 1? — what is the missing digit?
14. 14.51 × 4 =
15. 15.Magic trick! Think of 12. Double it, add 18, halve it, then take away 12. What number do you get?
16. 16.34 × 1000 =
17. 17.Half of 132 =
18. 18.?255 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
19. 19.A father is 44 years old and his son is 12. How old was the father when the son was born?
20. 20.28 × 4 =
21. 21.Magic square (every row, column and diagonal has the same total): ? 10 3 | 4 6 8 | 9 2 7. What is the missing number?
22. 22.If today is Sunday, what day will it be after 23 days? (a) Wednesday (b) Tuesday (c) Monday (d) Friday
23. 23.You have 7 coins. Each coin is ₹1 or ₹2, and together they make ₹12. How many ₹2 coins do you have?
24. 24.9 × 7 = 6? — what is the missing digit?
25. 25.81? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
26. 26.Think of 3. Multiply it by 3, then add 3. What number do you end with?
27. 27.383 × 10 =
28. 28.Do the 1089 trick with 492: reverse and subtract, then reverse that answer and add. What do you get?
29. 29.1 + 2 + 3 + … + 45 =
30. 30.12345 × 8 + 5 =
31. 31.638 × 10 =
32. 32.43 × 100 =
33. 33.248 × 10 =
34. 34.111111 × 111111 =
35. 35.23 × 100 =
36. 36.39 × 4 =
37. 37.If today is Tuesday, what day will it be after 73 days? (a) Friday (b) Monday (c) Saturday (d) Thursday
38. 38.8 × 9 =
39. 39.123456 × 8 + 6 =
40. 40.Magic trick! Think of 20. Double it, add 6, halve it, then take away 20. What number do you get?

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