I decided the corners needed to be curved to go with the curve on the table. I used a small plate and chalked on a curve to cut. Then added bias binding. I find the easiest way to add bias binding so that the stitching looks good on the front and the back is to pin on the binding encasing the edge with the back side slightly wider.
These are reversible so we can use both sides.
As much as I don't want these to get food on them, they are meant to be used and washed easily!