Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 347 · 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 Wednesday, what day will it be after 79 days? (a) Saturday (b) Monday (c) Friday (d) Thursday
2. 2.Half of 126 =
3. 3.Half of 16 =
4. 4.9 × 2 = ?8 — what is the missing digit?
5. 5.Do the 1089 trick with 118: reverse and subtract, then reverse that answer and add. What do you get?
6. 6.Magic trick! Think of 8. Double it, add 8, halve it, then take away 8. What number do you get?
7. 7.1 + 2 + 3 + … + 70 =
8. 8.9 × 6 = ?4 — what is the missing digit?
9. 9.Take 99 and take away the sum of its digits. What do you get?
10. 10.111 × 111 =
11. 11.1 + 2 + 3 + … + 90 =
12. 12.23 × 4 =
13. 13.A father is 37 years old and his son is 13. How old was the father when the son was born?
14. 14.If today is Sunday, what day will it be after 23 days? (a) Friday (b) Wednesday (c) Monday (d) Tuesday
15. 15.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
16. 16.9 × 9 =
17. 17.27 × 4 =
18. 18.1 + 2 + 3 + … + 42 =
19. 19.47 × 4 =
20. 20.Double 63 =
21. 21.A piggy bank has 6 coins of ₹5 and 12 coins of ₹2. How many rupees are in it?
22. 22.Do the 1089 trick with 498: reverse and subtract, then reverse that answer and add. What do you get?
23. 23.Do the 1089 trick with 934: reverse and subtract, then reverse that answer and add. What do you get?
24. 24.Half of 184 =
25. 25.The 3rd of a month is a Saturday. What day is the 21st of the same month? (a) Tuesday (b) Wednesday (c) Saturday (d) Thursday
26. 26.Magic square (every row, column and diagonal has the same total): 17 ? 11 | 14 20 26 | 29 8 23. What is the missing number?
27. 27.29?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
28. 28.Do the 1089 trick with 850: reverse and subtract, then reverse that answer and add. What do you get?
29. 29.The ages of two twins add up to 26. How old is each twin?
30. 30.Magic trick! Think of 16. Double it, add 14, halve it, then take away 16. What number do you get?
31. 31.Magic square (every row, column and diagonal has the same total): 2 7 6 | 9 5 ? | 4 3 8. What is the missing number?
32. 32.111111 × 111111 =
33. 33.254 × 10 =
34. 34.Double 21 =
35. 35.A father is 44 years old and his son is 12. How old was the father when the son was born?
36. 36.A piggy bank has 11 coins of ₹5 and 15 coins of ₹2. How many rupees are in it?
37. 37.69 × ? = 6900
38. 38.What comes next? 6, 9, 12, 15, ? (a) 15 (b) 21 (c) 18 (d) 19
39. 39.1 + 2 + 3 + … + 86 =
40. 40.I thought of a number, added 6 and then doubled it. I got 38. What was my number?

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