Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 68 · 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. 1.4 × 9 =
2. 2.9 × 5 =
3. 3.Take 20 and take away the sum of its digits. What do you get?
4. 4.44 × 4 =
5. 5.1234 × 9 + 5 =
6. 6.Magic square (every row, column and diagonal has the same total): 10 15 14 | 17 13 ? | 12 11 16. What is the missing number?
7. 7.?95 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
8. 8.9 × 6 = 5? — what is the missing digit?
9. 9.9 × 7 = 6? — what is the missing digit?
10. 10.Magic square (every row, column and diagonal has the same total): ? 15 17 | 11 19 27 | 21 23 13. What is the missing number?
11. 11.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
12. 12.1 + 2 + 3 + … + 66 =
13. 13.146 × 10 =
14. 14.1 + 2 + 3 + … + 9 =
15. 15.9 × 4 = ?6 — what is the missing digit?
16. 16.1 + 2 + 3 + … + 52 =
17. 17.27 × ? = 27000
18. 18.6 × 9 =
19. 19.1 + 3 + 5 + … + 43 =
20. 20.12 × 8 + 2 =
21. 21.12345679 × 9 =
22. 22.1111 × 1111 =
23. 23.?406 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
24. 24.12 × 4 =
25. 25.1 + 2 + 3 + … + 75 =
26. 26.1 + 2 + 3 + … + 6 =
27. 27.37 × 15 =
28. 28.9 × 2 = 1? — what is the missing digit?
29. 29.8 × 9 =
30. 30.396 + 693 =
31. 31.12345 × 8 + 5 =
32. 32.Magic trick! Think of 19. Double it, add 8, halve it, then take away 19. What number do you get?
33. 33.123456789 × 8 + 9 =
34. 34.6 × 4 =
35. 35.34 × 4 =
36. 36.37 × 18 =
37. 37.Half of 68 =
38. 38.What comes next? 2, 4, 8, 16, ? (a) 28 (b) 32 (c) 33 (d) 24
39. 39.900 × ? = 9000
40. 40.1234567 × 9 + 8 =

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