Go trupeach! If I'm ever stranded on an island, I want you with me!
Dora, do you have any rulers? Most of them can adapt to squaring up if you play with them. Let us know what you have and maybe we can walk you through the process. And put the 12-1/2" square ruler on your Christmas list. They're not too expensive if you use a coupon at Jo-Ann's. It will be an invaluable tool that you will use over and over.