68 inches by 72 inches = 4896 inches
4896 inches divided by 144 inches = 34 square feet
144 square inches in a square foot (12 x 12)
I figure a yard of fabric - after washing - has about 35 x 40 square inches of usable fabric , which is 1400 square inches
35 x 42 = 1470
It looks like odd shapes that wouldn't cut very efficiently - and if you are using the paper piecing method - and want to fussy cut for design -
??