Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 694 · 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.The ages of two twins add up to 8. How old is each twin?
2. 2.1 + 2 + 3 + … + 65 =
3. 3.7 × 9 =
4. 4.I thought of a number, multiplied it by 2 and added 5. I got 27. What was my number?
5. 5.I thought of a number, multiplied it by 3 and added 2. I got 23. What was my number?
6. 6.11111 × 11111 =
7. 7.594 + 495 =
8. 8.You have 11 coins. Each coin is ₹1 or ₹2, and together they make ₹15. How many ₹2 coins do you have?
9. 9.Think of 2. Multiply it by 3, then add 9. What number do you end with?
10. 10.11 × 4 =
11. 11.Half of 162 =
12. 12.1 + 3 + 5 + … + 13 =
13. 13.Take 470. Reverse its digits and take the smaller number away from the bigger one. What do you get?
14. 14.36 × 10 =
15. 15.Magic trick! Think of 19. Double it, add 6, halve it, then take away 19. What number do you get?
16. 16.1 + 2 + 3 + … + 8 =
17. 17.I thought of a number, multiplied it by 2 and added 2. I got 20. What was my number?
18. 18.Magic square (every row, column and diagonal has the same total): 32 11 26 | 17 23 ? | 20 35 14. What is the missing number?
19. 19.In 4 years a boy will be 12 years old. How old was he 3 years ago?
20. 20.9 × 8 = ?2 — what is the missing digit?
21. 21.198 + 891 =
22. 22.Magic square (every row, column and diagonal has the same total): 8 7 12 | 13 ? 5 | 6 11 10. What is the missing number?
23. 23.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
24. 24.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
25. 25.Take 87 and take away the sum of its digits. What do you get?
26. 26.1 + 2 + 3 + … + 33 =
27. 27.Take 881. Reverse its digits and take the smaller number away from the bigger one. What do you get?
28. 28.891 + 198 =
29. 29.9 × 3 = ?7 — what is the missing digit?
30. 30.The ages of two twins add up to 22. How old is each twin?
31. 31.Take 18 and take away the sum of its digits. What do you get?
32. 32.Half of 18 =
33. 33.1 + 3 + 5 + … + 11 =
34. 34.Magic square (every row, column and diagonal has the same total): 11 21 7 | 9 13 ? | 19 5 15. What is the missing number?
35. 35.What comes next? 9, 16, 25, 36, ? (a) 51 (b) 47 (c) 50 (d) 49
36. 36.Magic square (every row, column and diagonal has the same total): 19 9 23 | 21 ? 13 | 11 25 15. What is the missing number?
37. 37.1 + 2 + 3 + … + 36 =
38. 38.57 × 10 =
39. 39.I thought of a number, added 9 and then doubled it. I got 24. What was my number?
40. 40.85 × ? = 8500

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