Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 898 · 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 209. Reverse its digits and take the smaller number away from the bigger one. What do you get?
2. 2.Magic square (every row, column and diagonal has the same total): 13 15 ? | 3 11 19 | 17 7 9. What is the missing number?
3. 3.9 × 5 =
4. 4.Half of 42 =
5. 5.12345678 × 8 + 8 =
6. 6.Double 77 =
7. 7.If today is Wednesday, what day will it be after 100 days? (a) Saturday (b) Monday (c) Thursday (d) Friday
8. 8.58 × 4 =
9. 9.Double 43 =
10. 10.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
11. 11.123 × 9 + 4 =
12. 12.1 + 3 + 5 + … + 43 =
13. 13.15 × 4 =
14. 14.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
15. 15.Magic square (every row, column and diagonal has the same total): 7 28 13 | 22 16 10 | ? 4 25. What is the missing number?
16. 16.Think of 13. Multiply it by 5, then add 2. What number do you end with?
17. 17.A girl is 6 years old and her brother is 4 years older. How old will her brother be in 7 years?
18. 18.What comes next? 3, 6, 12, 24, ? (a) 48 (b) 36 (c) 49 (d) 42
19. 19.1234 × 9 + 5 =
20. 20.9 × 10 = ?0 — what is the missing digit?
21. 21.19 × 4 =
22. 22.If today is Monday, what day will it be after 36 days? (a) Friday (b) Tuesday (c) Wednesday (d) Monday
23. 23.9 × 8 = ?2 — what is the missing digit?
24. 24.37 × 27 =
25. 25.838 × 10 =
26. 26.Take 713. Reverse its digits and take the smaller number away from the bigger one. What do you get?
27. 27.198 + 891 =
28. 28.693 + 396 =
29. 29.1 + 2 + 3 + … + 79 =
30. 30.1 + 2 + 3 + … + 42 =
31. 31.1 × 9 =
32. 32.If today is Thursday, what day will it be after 22 days? (a) Saturday (b) Thursday (c) Monday (d) Friday
33. 33.123456789 × 8 + 9 =
34. 34.Magic square (every row, column and diagonal has the same total): ? 6 7 | 4 8 12 | 9 10 5. What is the missing number?
35. 35.Do the 1089 trick with 562: reverse and subtract, then reverse that answer and add. What do you get?
36. 36.2 × 9 =
37. 37.What comes next? 1, 2, 4, 8, ? (a) 14 (b) 12 (c) 17 (d) 16
38. 38.1 + 3 + 5 + … + 11 =
39. 39.Do the 1089 trick with 703: reverse and subtract, then reverse that answer and add. What do you get?
40. 40.If today is Monday, what day will it be after 80 days? (a) Wednesday (b) Thursday (c) Friday (d) Sunday

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