Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 830 · 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 piggy bank has 9 coins of ₹5 and 6 coins of ₹2. How many rupees are in it?
2. 2.Double 87 =
3. 3.1234567 × 9 + 8 =
4. 4.What comes next? 14, 23, 32, 41, ? (a) 41 (b) 50 (c) 59 (d) 51
5. 5.Magic trick! Think of 12. Double it, add 6, halve it, then take away 12. What number do you get?
6. 6.If today is Friday, what day was it 17 days ago? (a) Friday (b) Monday (c) Wednesday (d) Tuesday
7. 7.Magic square (every row, column and diagonal has the same total): 11 26 23 | 32 ? 8 | 17 14 29. What is the missing number?
8. 8.Think of 3. Multiply it by 3, then add 1. What number do you end with?
9. 9.In 2 years a boy will be 12 years old. How old was he 6 years ago?
10. 10.2?94 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
11. 11.40 × 1000 =
12. 12.31 × 1000 =
13. 13.9 × 9 =
14. 14.9 × 10 =
15. 15.Double 17 =
16. 16.Double 21 =
17. 17.Magic square (every row, column and diagonal has the same total): 5 15 13 | ? 11 3 | 9 7 17. What is the missing number?
18. 18.Magic square (every row, column and diagonal has the same total): ? 5 12 | 11 9 7 | 6 13 8. What is the missing number?
19. 19.1 + 3 + 5 + … + 43 =
20. 20.Do the 1089 trick with 680: reverse and subtract, then reverse that answer and add. What do you get?
21. 21.594 + 495 =
22. 22.1 + 2 + 3 + … + 72 =
23. 23.A father is 32 years old and his son is 4. How old was the father when the son was born?
24. 24.Half of 24 =
25. 25.I thought of a number, added 2 and then doubled it. I got 32. What was my number?
26. 26.12345679 × 81 =
27. 27.19 × 4 =
28. 28.I thought of a number, multiplied it by 4 and added 6. I got 42. What was my number?
29. 29.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
30. 30.You have 11 coins. Each coin is ₹1 or ₹2, and together they make ₹21. How many ₹2 coins do you have?
31. 31.9 × 4 =
32. 32.1 + 2 + 3 + … + 58 =
33. 33.I thought of a number, added 8 and then doubled it. I got 54. What was my number?
34. 34.136 × ? = 1360
35. 35.I thought of a number, multiplied it by 5 and added 3. I got 18. What was my number?
36. 36.What comes next? 15, 21, 27, 33, ? (a) 33 (b) 40 (c) 45 (d) 39
37. 37.Half of 134 =
38. 38.I thought of a number, multiplied it by 4 and added 1. I got 17. What was my number?
39. 39.1 + 2 + 3 + … + 10 =
40. 40.If today is Thursday, what day was it 21 days ago? (a) Friday (b) Thursday (c) Sunday (d) Wednesday

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