Yes, do cut your larger square first but make sure before cutting that you have enought to cut your smaller squares. Use your 15" to cut your 12.5" square as Jan described in her post. You might want to buy Omnigrid Glow-Line 1/4" Transparent fluorescent tape to mark the 12.5" line on your 15" ruler so you don't make any mistakes.
http://www.ebay.com/sch/i.html?_odkw...+tape&_sacat=0
Last edited by ManiacQuilter2; 01-28-2014 at 07:17 AM.