Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 917 · 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.Half of 162 =
2. 2.37 × 12 =
3. 3.What comes next? 2, 4, 8, 16, ? (a) 33 (b) 32 (c) 28 (d) 24
4. 4.246 × 10 =
5. 5.What comes next? 25, 36, 49, 64, ? (a) 79 (b) 82 (c) 81 (d) 83
6. 6.Magic square (every row, column and diagonal has the same total): 13 14 9 | 8 12 16 | ? 10 11. What is the missing number?
7. 7.1 + 2 + 3 + … + 23 =
8. 8.Magic trick! Think of 10. Double it, add 8, halve it, then take away 10. What number do you get?
9. 9.Magic square (every row, column and diagonal has the same total): ? 14 4 | 2 10 18 | 16 6 8. What is the missing number?
10. 10.10 × ? = 1000
11. 11.What comes next? 9, 16, 25, 36, ? (a) 51 (b) 50 (c) 47 (d) 49
12. 12.Magic square (every row, column and diagonal has the same total): 32 11 ? | 17 23 29 | 20 35 14. What is the missing number?
13. 13.11 × 11 =
14. 14.1 + 2 + 3 + … + 97 =
15. 15.6 × 9 =
16. 16.5?58 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
17. 17.Magic square (every row, column and diagonal has the same total): 3 10 5 | 8 ? 4 | 7 2 9. What is the missing number?
18. 18.40 × 1000 =
19. 19.Magic square (every row, column and diagonal has the same total): 29 14 17 | 8 20 32 | 23 ? 11. What is the missing number?
20. 20.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
21. 21.9 × 10 = ?0 — what is the missing digit?
22. 22.Do the 1089 trick with 610: reverse and subtract, then reverse that answer and add. What do you get?
23. 23.Take 810. Reverse its digits and take the smaller number away from the bigger one. What do you get?
24. 24.What comes next? 5, 10, 20, 40, ? (a) 60 (b) 81 (c) 70 (d) 80
25. 25.54 × 4 =
26. 26.123456 × 8 + 6 =
27. 27.9 × 7 = ?3 — what is the missing digit?
28. 28.1 + 3 + 5 + … + 19 =
29. 29.Magic square (every row, column and diagonal has the same total): 7 8 3 | 2 6 ? | 9 4 5. What is the missing number?
30. 30.If today is Monday, what day will it be after 44 days? (a) Wednesday (b) Tuesday (c) Thursday (d) Saturday
31. 31.Do the 1089 trick with 396: reverse and subtract, then reverse that answer and add. What do you get?
32. 32.Magic square (every row, column and diagonal has the same total): 15 ? 23 | 25 17 9 | 11 21 19. What is the missing number?
33. 33.93 × 100 =
34. 34.9 × 3 = 2? — what is the missing digit?
35. 35.1234 × 9 + 5 =
36. 36.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
37. 37.3 × 9 =
38. 38.9 × 2 = ?8 — what is the missing digit?
39. 39.28 × 1000 =
40. 40.37 × 15 =

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