The Quilt Saga Continues

So tonight I started to cut the squares for my quilt.  5x5, and I started with the brown since that was the smallest amount of material to work with.  I decided to cut it all, just to have the squares cut in case I make another quilt.  Well 78 squares later, I'm done. 

I will not be cutting ALL the other material, I repeat I will NOT be cutting all the other material.  I'm only going to cut what I need and a couple more for mistakes.  :-) 

Based on my calculations (which I shouldn't trust) I should have had 3 times what I needed.  Considering my mistake explained in yesterdays post.  So that means 21 right?  I need 7sqs. and 7 times 3 is 21.  Well how in the H E double hockey sticks did I get 78 (I should have had 80 cause I messed up with one cut) ? 

I have No Idea, and my brain is tired of trying to figure it out!

I do know that when I was mapping it all out, I forgot to figure in double due to the material being folded in 1/2.  So even IF I told the fabric lady the correct yard-age...I would have had double!!!  Geesh this is going to be one expensive quilt, money...and mentally!