Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 515 · 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. 1.9 × 6 = ?4 — what is the missing digit?
2. 2.316? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
3. 3.Magic trick! Think of 14. Double it, add 10, halve it, then take away 14. What number do you get?
4. 4.46 × 4 =
5. 5.198 + 891 =
6. 6.Magic trick! Think of 4. Double it, add 12, halve it, then take away 4. What number do you get?
7. 7.12345679 × 63 =
8. 8.Magic square (every row, column and diagonal has the same total): 14 12 22 | 24 ? 8 | 10 20 18. What is the missing number?
9. 9.9 × 3 = ?7 — what is the missing digit?
10. 10.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
11. 11.37 × 4 =
12. 12.9 × 8 =
13. 13.123456789 × 8 + 9 =
14. 14.What comes next? 9, 16, 25, 36, ? (a) 50 (b) 49 (c) 47 (d) 51
15. 15.74 × ? = 7400
16. 16.56 × 4 =
17. 17.I thought of a number, added 9 and then doubled it. I got 42. What was my number?
18. 18.9 × 4 = ?6 — what is the missing digit?
19. 19.34 × 4 =
20. 20.A piggy bank has 11 coins of ₹5 and 5 coins of ₹2. How many rupees are in it?
21. 21.If today is Monday, what day was it 20 days ago? (a) Monday (b) Friday (c) Wednesday (d) Tuesday
22. 22.39 × 4 =
23. 23.1111 × 1111 =
24. 24.396 + 693 =
25. 25.Magic square (every row, column and diagonal has the same total): 5 ? 7 | 10 8 6 | 9 4 11. What is the missing number?
26. 26.9 × 7 = ?3 — what is the missing digit?
27. 27.Magic square (every row, column and diagonal has the same total): 8 15 ? | 13 11 9 | 12 7 14. What is the missing number?
28. 28.9 × 1 =
29. 29.Take 844. Reverse its digits and take the smaller number away from the bigger one. What do you get?
30. 30.20 × 4 =
31. 31.Magic trick! Think of 6. Double it, add 10, halve it, then take away 6. What number do you get?
32. 32.1 + 2 + 3 + … + 94 =
33. 33.9 × 8 = 7? — what is the missing digit?
34. 34.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
35. 35.Magic square (every row, column and diagonal has the same total): 18 20 10 | 8 16 24 | 22 12 ?. What is the missing number?
36. 36.1 + 2 + 3 + … + 13 =
37. 37.4 × 9 =
38. 38.700? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
39. 39.4 × 100 =
40. 40.Magic square (every row, column and diagonal has the same total): 3 10 5 | ? 6 4 | 7 2 9. What is the missing number?

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