Jo Anne B.

I am thinking of adding a column of 9 in. square blocks to yardage.
The quilt top is 49 in. wide, yardage is 43 in. wide.
Can I get by with a 1/4 seam vs 1/2 seam?
If my math is correct, the semi finished backing = 51.5 in.
quilt top =49.0 in.
The column would be on the side of yardage.

Thanks for your help!!
Jo Anne B.