Attack Bonus

[Dex]

On the Base Save and Attack Bonus tables it shows the fighters get +1 to attack for each level. At level six is shows +6/+1. At level 18 it shows +18/+13/+8/+3. What do the additional numbers mean?

[Kameleon]

You get extra attacks as a fighter - 2 at lvl 6, 3 at lvl 11, 4 at lvl 16. Those extra attacks have a lower Attack Rating than your first attack, but gradually improve with levels.

[Mathurin]

You get extra attacks with every class. Every character gets an extra attack each time their BAB raises above a multiple of 5. It simply takes some classes longer because they recieve base attack bonuses at different rates.