gcf of 15 and 68, gcf of 15 and 8, gcf of 15 and 64, gcf of 15 and 80, gcf of 15 and 89, gcf of 15 and 60, gcf of 15 and 81, gcf of 15 and 65, gcf of 15 and 48, gcf of 15 and 63, gcf of 15 and 28, gcf of 15 and 38, gcf of 15 and 18, gcf of 15 and 180
gcf of 15 and 68. There are any references about gcf of 15 and 68 in here. you can look below.