How do you remove tile from a concrete floor?

If these are ceramic ect; and they are solid ;leave alone.

Depending on what you are going to replace them with;you could

screed over joints ect with floor compound .

If you have to lift them you could use a chisel or hire a small power tool

with a chisel point.;but even then you could be left with rough floor and

still have to screed.

I your going to lay a vinly you might cover with ply this you would have to be

fixed with rawlplugs/screws.