Sure! Here are 30 subtraction equations with their answers:

1. 987 - 456 = 531
2. 876 - 234 = 642
3. 765 - 321 = 444
4. 654 - 123 = 531
5. 543 - 432 = 111
6. 432 - 321 = 111
7. 321 - 123 = 198
8. 210 - 123 = 87
9. 109 - 98 = 11
10. 98 - 87 = 11
11. 87 - 76 = 11
12. 76 - 65 = 11
13. 65 - 54 = 11
14. 54 - 43 = 11
15. 43 - 32 = 11
16. 32 - 21 = 11
17. 21 - 10 = 11
18. 999 - 111 = 888
19. 888 - 777 = 111
20. 777 - 666 = 111
21. 666 - 555 = 111
22. 555 - 444 = 111
23. 444 - 333 = 111
24. 333 - 222 = 111
25. 222 - 111 = 111
26. 111 - 99 = 12
27. 99 - 88 = 11
28. 88 - 77 = 11
29. 77 - 66 = 11
30. 66 - 55 = 11

I hope this helps! Let me know if you need any further assistance.