If you sewed the squares together into a piece 10 squares down and 10 squares across, that'd take 100 squares, and the piece would be 25" by 25" square. (2.5" times 10 is 25") Actually it would be smaller than that, because I didn't subtract for seam allowances anywhere. That's just to give you a quick size guesstimate. Sorry. You can enlarge it a bit with sashing strips between each square, and some borders, but still, 100 squares a lap quilt does not make.
I wish!