How do you say yeah how about in french?

There isn't a direct translation of "yeah, how about" into French that perfectly captures the informal, suggestive tone of the phrase. Here are a few ways to express a similar meaning, depending on the context:

Informal:

* Ouais, et pourquoi pas? (Yeah, and why not?)

* Ouais, ça te dirait? (Yeah, would you like that?)

* Ouais, qu'est-ce que tu en penses? (Yeah, what do you think?)

More formal:

* Oui, pourquoi pas? (Yes, why not?)

* Oui, cela vous conviendrait-il? (Yes, would that suit you?)

* Oui, que pensez-vous de cela? (Yes, what do you think of that?)

The best translation will depend on the specific situation and your relationship with the person you are speaking to.