Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 566 · 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.If today is Saturday, what day will it be after 54 days? (a) Friday (b) Thursday (c) Sunday (d) Wednesday
2. 2.If today is Wednesday, what day was it 29 days ago? (a) Monday (b) Wednesday (c) Friday (d) Tuesday
3. 3.Magic square (every row, column and diagonal has the same total): 13 8 9 | ? 10 14 | 11 12 7. What is the missing number?
4. 4.58 × 4 =
5. 5.1 + 3 + 5 + … + 11 =
6. 6.502 × ? = 5020
7. 7.A piggy bank has 4 coins of ₹5 and 7 coins of ₹2. How many rupees are in it?
8. 8.58 × 100 =
9. 9.98 × 100 =
10. 10.Think of 15. Multiply it by 4, then add 1. What number do you end with?
11. 11.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
12. 12.1 + 2 + 3 + … + 10 =
13. 13.2?51 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
14. 14.9 × 4 = 3? — what is the missing digit?
15. 15.What comes next? 5, 10, 20, 40, ? (a) 81 (b) 60 (c) 70 (d) 80
16. 16.A father is 45 years old and his son is 10. How old was the father when the son was born?
17. 17.1234567 × 9 + 8 =
18. 18.1 + 3 + 5 + … + 35 =
19. 19.A father is 30 years old and his son is 14. How old was the father when the son was born?
20. 20.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
21. 21.The 3rd of a month is a Friday. What day is the 30th of the same month? (a) Wednesday (b) Sunday (c) Thursday (d) Friday
22. 22.1 + 2 + 3 + … + 46 =
23. 23.Take 32 and take away the sum of its digits. What do you get?
24. 24.1 + 2 + 3 + … + 45 =
25. 25.9 × 7 =
26. 26.37 × 27 =
27. 27.Magic square (every row, column and diagonal has the same total): 6 27 12 | 21 15 9 | 18 3 ?. What is the missing number?
28. 28.9 × 2 = ?8 — what is the missing digit?
29. 29.Double 38 =
30. 30.3 × 9 =
31. 31.9 × 7 = 6? — what is the missing digit?
32. 32.The ages of two twins add up to 16. How old is each twin?
33. 33.Take 638. Reverse its digits and take the smaller number away from the bigger one. What do you get?
34. 34.Magic square (every row, column and diagonal has the same total): 10 5 ? | 3 7 11 | 8 9 4. What is the missing number?
35. 35.21 × 4 =
36. 36.54 × 4 =
37. 37.Take 660. Reverse its digits and take the smaller number away from the bigger one. What do you get?
38. 38.1234 × 9 + 5 =
39. 39.9 × 3 = 2? — what is the missing digit?
40. 40.Take 770. Reverse its digits and take the smaller number away from the bigger one. What do you get?

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