Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 876 · 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.Double 32 =
2. 2.Magic square (every row, column and diagonal has the same total): 8 29 14 | 23 17 11 | 20 5 ?. What is the missing number?
3. 3.Half of 22 =
4. 4.You have 7 coins. Each coin is ₹1 or ₹2, and together they make ₹10. How many ₹2 coins do you have?
5. 5.9 × 5 =
6. 6.Magic trick! Think of 7. Double it, add 4, halve it, then take away 7. What number do you get?
7. 7.If today is Monday, what day was it 44 days ago? (a) Friday (b) Tuesday (c) Saturday (d) Sunday
8. 8.In 5 years a boy will be 13 years old. How old was he 3 years ago?
9. 9.1 + 2 + 3 + … + 64 =
10. 10.Take 285. Reverse its digits and take the smaller number away from the bigger one. What do you get?
11. 11.You have 11 coins. Each coin is ₹1 or ₹2, and together they make ₹16. How many ₹2 coins do you have?
12. 12.I thought of a number, added 3 and then doubled it. I got 34. What was my number?
13. 13.Double 56 =
14. 14.Double 42 =
15. 15.917 × 10 =
16. 16.33 × 4 =
17. 17.Think of 12. Multiply it by 3, then add 3. What number do you end with?
18. 18.I thought of a number, multiplied it by 4 and added 3. I got 19. What was my number?
19. 19.Do the 1089 trick with 940: reverse and subtract, then reverse that answer and add. What do you get?
20. 20.2 × 9 =
21. 21.What comes next? 36, 49, 64, 81, ? (a) 98 (b) 102 (c) 100 (d) 101
22. 22.What comes next? 13, 18, 23, 28, ? (a) 38 (b) 34 (c) 28 (d) 33
23. 23.594 + 495 =
24. 24.1234567 × 8 + 7 =
25. 25.1 + 2 + 3 + … + 37 =
26. 26.If today is Sunday, what day will it be after 12 days? (a) Saturday (b) Friday (c) Monday (d) Thursday
27. 27.29 × 4 =
28. 28.37 × 18 =
29. 29.Take 966. Reverse its digits and take the smaller number away from the bigger one. What do you get?
30. 30.9 × 4 = 3? — what is the missing digit?
31. 31.6 × 9 =
32. 32.Magic trick! Think of 13. Double it, add 4, halve it, then take away 13. What number do you get?
33. 33.Double 11 =
34. 34.1 + 3 + 5 + … + 43 =
35. 35.Magic square (every row, column and diagonal has the same total): 4 3 8 | ? 5 1 | 2 7 6. What is the missing number?
36. 36.Do the 1089 trick with 851: reverse and subtract, then reverse that answer and add. What do you get?
37. 37.1 + 3 + 5 + … + 31 =
38. 38.10 × 4 =
39. 39.Half of 42 =
40. 40.84 × ? = 840

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