Terrible at math!!
 

I hate Math...always have! I didn't realize quilting would involve all this math!! Ugh, anyhow....I bought this little charm pack of 100 2.5" squares. Can I turn that into a lap quilt??? Is there enough fabric for that?

Sorry for my stupid question. Every time I whip out the calculator I end up frustrated.

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!

How about a doll quilt? A 2.5" square finishes at 2", so a 10X10 grid of these squares would finish at 20" X 20".
To keep it easy with square quilts:
If you wanted a VERY small lap quit of 40" X 40", it would require 4 of these packs, and you would sew a grid of 20X20 squares.
A 60" X60" quilt would need 9 packs, and you would sew a 30 X30 grid.

You could attach them to strips of a solid (black or white, your preference) and have the color blocks staggered. In other words, start one strip with an 8" strip, then a color block, then a 10", and a color, and a 10", and on until you've used four colors and have a strip 48" long. Then do another strip, but attach it with a 10" starter next to the 8" starter to staircase the color blocks a little. You'll end up with 24 strips, for a width of 48". If you found a good border print, you could have a decent lap quilt, but you'll use up a lot of the background fabric!

:) Thank you ladies!!!

The easiest way to figure this is to subtract the seam allowances first. Your squares start out at 2.5", and if you subtract a quarter inch on each side (or a half inch for both), your squares, once sewn, will measure 2".