How are you? How are you doing? - This is more formal than "How are you?" How are you going? - This is probably the most natural option. It's fairly casual and friendly, but it's not slang. It's extremely common, at least in Australia. How's it going? - This is slang. It's apparently very common in the US. What's up? - This is also slang. How do you do? - I've never actually heard someone say this. How have you been (recently)?

In America, more "politely" we say either "How are you?" or "How are you doing?" and more casually we say "What's up?" or "How's it goin'?" I have never heard an American use "How are you going?" I think it would confuse us :) I definitely agree with "How have you been?" as well, it's also pretty common. Other options: "How's life?" "What's new (with you)?" "

you can also use , How do you do?

Ey up mi duck :) True british

"How are you?" and "How are you doing?" ... there's no difference really.