Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 605 · 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.Do the 1089 trick with 940: reverse and subtract, then reverse that answer and add. What do you get?
2. 2.14 × 100 =
3. 3.2 × 9 =
4. 4.7?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
5. 5.Half of 172 =
6. 6.9 × 9 =
7. 7.Magic trick! Think of 14. Double it, add 18, halve it, then take away 14. What number do you get?
8. 8.64?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
9. 9.If today is Sunday, what day was it 51 days ago? (a) Friday (b) Thursday (c) Monday (d) Saturday
10. 10.I thought of a number, added 3 and then doubled it. I got 22. What was my number?
11. 11.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
12. 12.9 × 4 = 3? — what is the missing digit?
13. 13.Take 37 and take away the sum of its digits. What do you get?
14. 14.1 + 2 + 3 + … + 37 =
15. 15.Magic square (every row, column and diagonal has the same total): 16 11 12 | 9 13 17 | ? 15 10. What is the missing number?
16. 16.If today is Saturday, what day will it be after 16 days? (a) Thursday (b) Monday (c) Sunday (d) Tuesday
17. 17.Odd one out: which number is NOT in the 3 times table? (a) 18 (b) 24 (c) 9 (d) 16
18. 18.If today is Friday, what day will it be after 84 days? (a) Saturday (b) Monday (c) Thursday (d) Friday
19. 19.1 + 2 + 3 + … + 20 =
20. 20.I thought of a number, multiplied it by 3 and added 4. I got 28. What was my number?
21. 21.Double 45 =
22. 22.9 × 7 = 6? — what is the missing digit?
23. 23.9 × 10 =
24. 24.Magic square (every row, column and diagonal has the same total): 27 6 21 | ? 18 24 | 15 30 9. What is the missing number?
25. 25.Magic square (every row, column and diagonal has the same total): 7 2 9 | 8 6 4 | ? 10 5. What is the missing number?
26. 26.Double 84 =
27. 27.Take 562. Reverse its digits and take the smaller number away from the bigger one. What do you get?
28. 28.123456789 × 8 + 9 =
29. 29.693 + 396 =
30. 30.396 + 693 =
31. 31.59 × 4 =
32. 32.1 + 2 + 3 + … + 43 =
33. 33.111111 × 111111 =
34. 34.1 + 3 + 5 + … + 9 =
35. 35.12345679 × 81 =
36. 36.Do the 1089 trick with 542: reverse and subtract, then reverse that answer and add. What do you get?
37. 37.123 × 9 + 4 =
38. 38.6 × 4 =
39. 39.You have 8 coins. Each coin is ₹1 or ₹2, and together they make ₹13. How many ₹2 coins do you have?
40. 40.Double 71 =

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