http://www.quiltmaker.com/content_do...asurements.pdf

Suggested finished size for a twin would be 68x89 inches. Assuming your 8 inch blocks are unfinished, you would wind up with blocks 7 1/2 inches. 68/7.5 = 9 blocks across. If you used 8 blocks across it would allow for a 3-4 inch border. 89/7.5 = 11 - so 10 blocks down would give you room for a 3-4 inch border.


I'd make 80 blocks . . .