Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 445 · 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.Magic trick! Think of 5. Double it, add 10, halve it, then take away 5. What number do you get?
2. 2.1 + 2 + 3 + … + 22 =
3. 3.9 × 9 =
4. 4.Half of 192 =
5. 5.Magic square (every row, column and diagonal has the same total): ? 11 21 | 15 19 23 | 17 27 13. What is the missing number?
6. 6.Magic square (every row, column and diagonal has the same total): 16 ? 10 | 13 19 25 | 28 7 22. What is the missing number?
7. 7.49 × 4 =
8. 8.1 + 3 + 5 + … + 43 =
9. 9.Double 83 =
10. 10.If today is Wednesday, what day was it 48 days ago? (a) Sunday (b) Thursday (c) Wednesday (d) Friday
11. 11.9 × 8 = 7? — what is the missing digit?
12. 12.2 × 9 =
13. 13.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
14. 14.Do the 1089 trick with 471: reverse and subtract, then reverse that answer and add. What do you get?
15. 15.549? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
16. 16.7 × 9 =
17. 17.Take 31 and take away the sum of its digits. What do you get?
18. 18.Take 53 and take away the sum of its digits. What do you get?
19. 19.9 × 2 = ?8 — what is the missing digit?
20. 20.9 × 4 =
21. 21.44 × 4 =
22. 22.Do the 1089 trick with 601: reverse and subtract, then reverse that answer and add. What do you get?
23. 23.Magic square (every row, column and diagonal has the same total): 11 16 15 | 18 14 10 | ? 12 17. What is the missing number?
24. 24.494 × 10 =
25. 25.Take 23 and take away the sum of its digits. What do you get?
26. 26.1 + 2 + 3 + … + 21 =
27. 27.9 × 3 =
28. 28.37 × 27 =
29. 29.29 × 4 =
30. 30.The ages of two twins add up to 14. How old is each twin?
31. 31.What comes next? 5, 10, 20, 40, ? (a) 81 (b) 80 (c) 60 (d) 70
32. 32.12345678 × 9 + 9 =
33. 33.Do the 1089 trick with 431: reverse and subtract, then reverse that answer and add. What do you get?
34. 34.Magic square (every row, column and diagonal has the same total): 5 10 9 | 12 8 4 | 7 6 ?. What is the missing number?
35. 35.Do the 1089 trick with 631: reverse and subtract, then reverse that answer and add. What do you get?
36. 36.1 × 9 =
37. 37.1 + 2 + 3 + … + 28 =
38. 38.9 × 6 = 5? — what is the missing digit?
39. 39.80 × ? = 8000
40. 40.1234567 × 8 + 7 =

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