Leaving Tail at end of Square

I am new to this site and excited about getting started. I have made squares for Knit a Square for Africa, and those instructions had us leave a 1 1/4 yd tail at the end of the square at time of binding off to use to sew squares together. Is this also needed on your squares? If not, I am confused on how they would be put together. Please let me know as I am feverishly making them now to be dropped off at our local Michaels Store in 2 weeks! Thx so much!