"Scant" quarter inch really is just a thread or two shy of a true quarter inch, not as much as 1/16'th. As you sew, 1/8'th multiplied by each seam soon adds up to an inch or so added across the whole quilt. In some blocks you can fudge and make them fit together, but you would be doing well to figure out your sc. 1/4" seam line if you eventually want to make quilts with more piecing requirements. One recommended way to do this is to cut 3 pieces of fabric the same size (i.e. 2 1/2" x 6 1/2"), sew them together, using your 1/4" seam, pressing the seams as you wish and then measuring your sample. In this ex. it should measure 6 1/2" x 6 1/2" exactly. Work on this until you can get a true measurement and mark this somehow on your machine so when you need to be exact you have a guide. (In my case, using my Janome with the 1/4" foot with a guide I just have to move the needle one spot to the left to find my correct 1/4")