Thanks to all who replied. PaperPrincess hit it right on the head, which made me hit my head and say DUH!! I don't know why I was overthinking, but I originally thought I would have to find the square root of 37 divided by 3 1/2 times 19, or some other complicated formula, when all I really had to do was add 1/2 inch to my dimensions. Anyway, thanks everyone. One of the reasons I love this Board so much... somebody usually knows the answer ( the right one) and usually pretty quickly. Off to cut some 10-inch squares , lol