The 1/4 or scant 1/4 is not that important. Every machine and every person sews differently. When do sew the block, check the size of each component of that block after you stitch. Is it coming out the size they want it to be? example: If you stitch tree strips together and each one is cut 2 1/2 inches wide, check the center strip. Is it really 2 inches wide now? If it is larger, you need to increase the width of your seam allowance. If the center strip is smaller, you will have to narrow your seam allowance. The outside strips should measure 2 1/4 inch each. Then you could cut the three strip piece in 6 1/2 inch pieces, for a block to finish 6 inch. Hope you know what I am trying to say. It is easier to show someone. Good luck!