Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 21 · 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. 1.9 × 8 = 7? — what is the missing digit?
2. 2.9 × 5 = 4? — what is the missing digit?
3. 3.1 + 3 + 5 + … + 41 =
4. 4.1 + 2 + 3 + … + 79 =
5. 5.A piggy bank has 10 coins of ₹5 and 13 coins of ₹2. How many rupees are in it?
6. 6.Think of 11. Multiply it by 5, then add 1. What number do you end with?
7. 7.53 × 4 =
8. 8.?295 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
9. 9.1 + 2 + 3 + … + 96 =
10. 10.Magic trick! Think of 2. Double it, add 12, halve it, then take away 2. What number do you get?
11. 11.Magic square (every row, column and diagonal has the same total): 14 4 18 | 16 12 8 | 6 20 ?. What is the missing number?
12. 12.Magic square (every row, column and diagonal has the same total): ? 8 13 | 14 10 6 | 7 12 11. What is the missing number?
13. 13.If today is Monday, what day was it 43 days ago? (a) Saturday (b) Wednesday (c) Sunday (d) Monday
14. 14.57 × 100 =
15. 15.187 × 10 =
16. 16.9 × 2 = 1? — what is the missing digit?
17. 17.Magic trick! Think of 13. Double it, add 10, halve it, then take away 13. What number do you get?
18. 18.1 + 2 + 3 + … + 33 =
19. 19.I thought of a number, multiplied it by 4 and added 8. I got 44. What was my number?
20. 20.Think of 12. Multiply it by 5, then add 3. What number do you end with?
21. 21.1 + 2 + 3 + … + 42 =
22. 22.Think of 13. Multiply it by 2, then add 6. What number do you end with?
23. 23.Half of 96 =
24. 24.10 × 1000 =
25. 25.Take 40 and take away the sum of its digits. What do you get?
26. 26.2 × 9 =
27. 27.12345679 × 36 =
28. 28.If today is Monday, what day will it be after 42 days? (a) Thursday (b) Tuesday (c) Monday (d) Sunday
29. 29.If today is Wednesday, what day was it 25 days ago? (a) Sunday (b) Tuesday (c) Saturday (d) Friday
30. 30.9 × 7 =
31. 31.27?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
32. 32.I thought of a number, multiplied it by 3 and added 6. I got 30. What was my number?
33. 33.9 × 6 = 5? — what is the missing digit?
34. 34.?034 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
35. 35.9 × 7 = 6? — what is the missing digit?
36. 36.Half of 102 =
37. 37.1234567 × 9 + 8 =
38. 38.If today is Wednesday, what day was it 16 days ago? (a) Monday (b) Sunday (c) Thursday (d) Tuesday
39. 39.26 × 4 =
40. 40.You have 13 coins. Each coin is ₹1 or ₹2, and together they make ₹22. How many ₹2 coins do you have?

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