Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 909 · 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. 1.12345679 × 9 =
2. 2.If today is Monday, what day was it 37 days ago? (a) Saturday (b) Sunday (c) Friday (d) Tuesday
3. 3.Magic square (every row, column and diagonal has the same total): ? 9 19 | 21 13 5 | 7 17 15. What is the missing number?
4. 4.1 + 2 + 3 + … + 72 =
5. 5.9 × 7 = ?3 — what is the missing digit?
6. 6.12345679 × 18 =
7. 7.87 × 10 =
8. 8.297 + 792 =
9. 9.111 × 111 =
10. 10.25 × 1000 =
11. 11.Double 91 =
12. 12.6 × 4 =
13. 13.665 × ? = 6650
14. 14.123456 × 8 + 6 =
15. 15.Magic square (every row, column and diagonal has the same total): 13 28 25 | 34 ? 10 | 19 16 31. What is the missing number?
16. 16.Magic square (every row, column and diagonal has the same total): 17 ? 13 | 15 19 23 | 25 11 21. What is the missing number?
17. 17.You have 7 coins. Each coin is ₹1 or ₹2, and together they make ₹8. How many ₹2 coins do you have?
18. 18.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
19. 19.9 × 3 = ?7 — what is the missing digit?
20. 20.If today is Tuesday, what day was it 33 days ago? (a) Sunday (b) Friday (c) Wednesday (d) Thursday
21. 21.9 × 3 =
22. 22.9 × 4 =
23. 23.24 × 4 =
24. 24.484? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
25. 25.1 + 2 + 3 + … + 10 =
26. 26.15 × ? = 1500
27. 27.Half of 92 =
28. 28.19?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
29. 29.37 × 3 =
30. 30.Take 964. Reverse its digits and take the smaller number away from the bigger one. What do you get?
31. 31.What comes next? 1, 2, 4, 8, ? (a) 12 (b) 16 (c) 14 (d) 17
32. 32.Take 318. Reverse its digits and take the smaller number away from the bigger one. What do you get?
33. 33.9 × 6 = ?4 — what is the missing digit?
34. 34.2?83 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
35. 35.Half of 54 =
36. 36.In 3 years a boy will be 17 years old. How old was he 2 years ago?
37. 37.1111 × 1111 =
38. 38.Think of 5. Multiply it by 2, then add 7. What number do you end with?
39. 39.58 × 4 =
40. 40.Double 93 =

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