Grandma Cindy. I will tell you, but this usually causes a discussion. Ok, first of all I have been quilting for almost 30 years. For my back and borders I tear the length wise grain of the fabric. I straighten the edge and measure over, make a very little cut 1/2 inch and tear. It is accurate and works every time. You will have a couple of long strings, just press after you tear. If you have any doubt tear on a smaller piece first.