Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 534 · 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.A father is 40 years old and his son is 5. How old was the father when the son was born?
2. 2.I thought of a number, multiplied it by 2 and added 9. I got 21. What was my number?
3. 3.69 × ? = 6900
4. 4.271 × 10 =
5. 5.Take 820. Reverse its digits and take the smaller number away from the bigger one. What do you get?
6. 6.8 × 4 =
7. 7.123 × 9 + 4 =
8. 8.If today is Thursday, what day was it 14 days ago? (a) Wednesday (b) Friday (c) Thursday (d) Sunday
9. 9.Take 92 and take away the sum of its digits. What do you get?
10. 10.What comes next? 14, 20, 26, 32, ? (a) 39 (b) 44 (c) 32 (d) 38
11. 11.Think of 5. Multiply it by 2, then add 6. What number do you end with?
12. 12.A piggy bank has 12 coins of ₹5 and 10 coins of ₹2. How many rupees are in it?
13. 13.Half of 126 =
14. 14.38 × 4 =
15. 15.46 × 4 =
16. 16.What comes next? 1, 5, 9, 13, ? (a) 13 (b) 21 (c) 18 (d) 17
17. 17.Double 28 =
18. 18.The ages of two twins add up to 18. How old is each twin?
19. 19.9 × 9 =
20. 20.9 × 7 = 6? — what is the missing digit?
21. 21.45 × ? = 4500
22. 22.12345679 × 81 =
23. 23.3?74 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
24. 24.16 × 4 =
25. 25.If today is Monday, what day will it be after 95 days? (a) Saturday (b) Thursday (c) Friday (d) Monday
26. 26.Double 31 =
27. 27.Half of 194 =
28. 28.Magic square (every row, column and diagonal has the same total): 20 23 8 | 5 17 ? | 26 11 14. What is the missing number?
29. 29.4 × 9 =
30. 30.What comes next? 17, 23, 29, 35, ? (a) 47 (b) 41 (c) 35 (d) 42
31. 31.Magic square (every row, column and diagonal has the same total): 11 10 15 | 16 12 8 | 9 14 ?. What is the missing number?
32. 32.904 × 10 =
33. 33.9 × 5 = 4? — what is the missing digit?
34. 34.Double 99 =
35. 35.What comes next? 11, 13, 15, 17, ? (a) 17 (b) 19 (c) 21 (d) 20
36. 36.Take 23 and take away the sum of its digits. What do you get?
37. 37.What comes next? 7, 12, 17, 22, ? (a) 32 (b) 28 (c) 22 (d) 27
38. 38.9 × 3 = 2? — what is the missing digit?
39. 39.I thought of a number, added 3 and then doubled it. I got 22. What was my number?
40. 40.12345679 × 63 =

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