Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 109 · 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.Take 50 and take away the sum of its digits. What do you get?
2. 2.Magic square (every row, column and diagonal has the same total): 24 27 12 | 9 ? 33 | 30 15 18. What is the missing number?
3. 3.20 × ? = 2000
4. 4.Half of 82 =
5. 5.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
6. 6.Magic square (every row, column and diagonal has the same total): 12 27 6 | 9 15 ? | 24 3 18. What is the missing number?
7. 7.302? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
8. 8.1 + 2 + 3 + … + 11 =
9. 9.Magic square (every row, column and diagonal has the same total): 12 2 16 | 14 10 ? | 4 18 8. What is the missing number?
10. 10.8?48 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
11. 11.12345679 × 9 =
12. 12.The ages of two twins add up to 24. How old is each twin?
13. 13.Magic trick! Think of 18. Double it, add 4, halve it, then take away 18. What number do you get?
14. 14.37 × 21 =
15. 15.3?74 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
16. 16.I thought of a number, added 9 and then doubled it. I got 46. What was my number?
17. 17.9 × 3 = ?7 — what is the missing digit?
18. 18.1 + 2 + 3 + … + 91 =
19. 19.Magic square (every row, column and diagonal has the same total): ? 7 8 | 5 9 13 | 10 11 6. What is the missing number?
20. 20.38 × 4 =
21. 21.1234567 × 9 + 8 =
22. 22.The 1st of a month is a Sunday. What day is the 30th of the same month? (a) Tuesday (b) Sunday (c) Monday (d) Thursday
23. 23.10 × 9 =
24. 24.Take 20 and take away the sum of its digits. What do you get?
25. 25.12345679 × 54 =
26. 26.9 × 6 = ?4 — what is the missing digit?
27. 27.37 × 12 =
28. 28.119 × ? = 1190
29. 29.9 × 9 =
30. 30.I thought of a number, added 8 and then doubled it. I got 54. What was my number?
31. 31.172 × 10 =
32. 32.1 + 3 + 5 + … + 21 =
33. 33.9 × 3 =
34. 34.884 × 10 =
35. 35.9 × 8 =
36. 36.Take 89 and take away the sum of its digits. What do you get?
37. 37.6 × 4 =
38. 38.12 × 9 + 3 =
39. 39.What comes next? 5, 10, 20, 40, ? (a) 60 (b) 81 (c) 70 (d) 80
40. 40.123 × 8 + 3 =

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