Can't subdivide the face

If I subdivide the face on right, I can’t subdivide the face of left. Why is that?

faceq.blend (468 KB)

I’m pretty sure Blender can’t subdivide nGons, as you have subdivided the right face, the left one now has 5 verticies, not 4, so it can’t be sub-divided. In this instance, you would have to use Knife to cut the face an constrict it on mid points.

Subdivide won’t divide that face but it does subdivide the edges. You can use J to join the verts it adds to the edges, or just select all the faces you want to subdivide and do them all at once.

I understand now. Thanks.