How many plates have only continental crust?

There isn't a plate that has only continental crust.

Explanation:

The tectonic plates are enormous pieces of crust that cover the surface of Earth. They are driven by the convection currents in the mantle layer and they are constantly moving in one direction or another. These plates can be divided into several different manners, depending what is looked for, and one of those divisions is in continental and oceanic plates.

While one may naturally assume that the continental plates have continental crust and the oceanic ones have oceanic crust, it is actually not like that. There isn't a single plate, small or large, continental or oceanic, that only has one type of crust. The continental plates indeed have mostly continental crust, but they also have a solid percentage of oceanic crust, usually found on the outskirts of the plates, or rather around the plate boundaries.