Math help needed!!!!
 

I am making a quilt for daughter. She wants 10" blocks with 2" borders and 2" corner stones. So I now have a 12"finished bloock. I can't figure out the size of the half square corner stones at the end of the on point rows. I know it can't be hard, but my mind just freezes up when I try to do any kind of math, no matter how simple.

Here's a handy chart.
http://quiltbug.com/Articles/on-point.htm

think of each row as a separate entity... you will have one row that is 2" corner block, 10" x 2" sashing, 2" corner block.....etc....

the next row will be 2 x 10 upright sashing, 10" block, 2 x 10 upright sashing, etc.... now you just have to sew the rows together... if this quilt is on point... then that's a whole different thing...

Yes, I forgot to mention, the quilt is on point.

I think just 2 7/8 if they finish at 2" and are HST, ya?