For a block with an unfinished size of 13 x 13; finished size of 12-1/2 x 12-1/2;
Cut piece 1A - 3 x 3 - finished size 2.5 x 2.5
Cut piece 1B - 3 x 8 - finished size 2.5 x 7.5
Cut piece 1C - 8 x 8 - finished size 7.5 x 7.5
Block 2 - all pieces are the same size as 1A - 3 x 3
For a block that finishes at 7.5 x 7.5 - unfinished size 8 x 8
Cut 1A - 2 x 2; finished size 1.5 x 1.5
Cut 1B - 2 x 5; finished size 1.5 x 4.5
Cut 1C - 5 x 5; finished size 4.5 x 4.5
All the pieces in Block 1 - cut 2 x 2 ; finished size 1.5 x 1.5
One can go to 1/4 inch increments -
block would finish at 11.25 x 11.25:
piece 1A - cut at 2.75 x 2.75 -
piece 1B - cut at 2.75 x 7.25
piece 1C - cut at 7.25 x 7.25
block would finish at 8.75 x 8.75:
piece 1A - cut at 2.25 x 2.25 -
piece 1B - cut at 2.25 x 5.75
piece 1C - cut at 5.75 x 5.75
piece 1A - cut at 1.75 x 1.75 -
block would finish at 5 x 5:
piece 1A - cut at 1.5 x 1.5 -
piece 1B - cut 1.5 x 3.5
piece 1C - cut 3.5 x 3.5