Edging the Squares

I've started edging the squares. This is what I'm doing. I'm joining the yarn in a corner with a sc, ch 3, sc. Then going around the sides, I'm using a ch 4, sk 3 sc, sc in next sc. I have approx. 40 stitches down each side of the square, so this is working out well for me. I end up with 10 ch 4 spaces and then the corner spaces of ch 3.