Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 793 · 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.The 8th of a month is a Saturday. What day is the 30th of the same month? (a) Saturday (b) Wednesday (c) Monday (d) Sunday
2. 2.1 + 3 + 5 + … + 23 =
3. 3.Take 49 and take away the sum of its digits. What do you get?
4. 4.123 × 8 + 3 =
5. 5.53?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
6. 6.12345678 × 9 + 9 =
7. 7.1?30 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
8. 8.1 + 2 + 3 + … + 68 =
9. 9.The 6th of a month is a Tuesday. What day is the 18th of the same month? (a) Sunday (b) Saturday (c) Wednesday (d) Monday
10. 10.891 + 198 =
11. 11.Half of 122 =
12. 12.1 + 3 + 5 + … + 45 =
13. 13.40 × 4 =
14. 14.50 × 4 =
15. 15.9 × 6 = 5? — what is the missing digit?
16. 16.Magic square (every row, column and diagonal has the same total): 16 9 14 | 11 13 15 | 12 17 ?. What is the missing number?
17. 17.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
18. 18.37 × 24 =
19. 19.I thought of a number, added 8 and then doubled it. I got 54. What was my number?
20. 20.51 × 4 =
21. 21.What comes next? 5, 10, 20, 40, ? (a) 81 (b) 70 (c) 80 (d) 60
22. 22.Magic square (every row, column and diagonal has the same total): 6 7 2 | 1 5 9 | 8 ? 4. What is the missing number?
23. 23.I thought of a number, added 7 and then doubled it. I got 34. What was my number?
24. 24.A girl is 6 years old and her brother is 3 years older. How old will her brother be in 6 years?
25. 25.Half of 164 =
26. 26.Magic square (every row, column and diagonal has the same total): ? 8 18 | 20 12 4 | 6 16 14. What is the missing number?
27. 27.9 × 7 = ?3 — what is the missing digit?
28. 28.A piggy bank has 3 coins of ₹5 and 7 coins of ₹2. How many rupees are in it?
29. 29.13 × 1000 =
30. 30.48 × 100 =
31. 31.12 × 8 + 2 =
32. 32.Magic trick! Think of 14. Double it, add 14, halve it, then take away 14. What number do you get?
33. 33.9 × 9 = ?1 — what is the missing digit?
34. 34.Take 156. Reverse its digits and take the smaller number away from the bigger one. What do you get?
35. 35.1 + 2 + 3 + … + 28 =
36. 36.Magic trick! Think of 12. Double it, add 6, halve it, then take away 12. What number do you get?
37. 37.9 × 3 =
38. 38.792 + 297 =
39. 39.?570 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
40. 40.Take 719. Reverse its digits and take the smaller number away from the bigger one. What do you get?

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