Regardless of what size project you’re using the Sudoku trick for when sewing with 2 ½” squares (be it placemats, mug rugs, coasters, a doll quilt, a baby quilt, you-name-it), when calculating the size top you want to make, the most important thing to remember is that your Width and Height should be divisible by 2” (size of finished pieces, once sewn in).
The formula looks like this:
Desired Width / 2 = Number of Horizontal Pieces
Desired Height / 2 = Number of Vertical Pieces
Horizontal Pieces x Vertical Pieces = Total number of 2 ½” squares needed.
Let’s put this into action!
For the Kid size placemat, the calculations look like this:
14” / 2 = (7) 2 ½” squares
10” / 2 = (5) 2 ½” squares
(7) 2 ½” squares x (5) 2 ½” squares = (35) 2 ½” squares (less than one mini charm pack)
For the Adult size placemat, the calculations look like this:
18” / 2 = (9) 2 ½” squares
12” / 2 = (6) 2 ½” squares
(9) 2 ½” squares x (6) 2 ½” squares = (54) 2 ½” squares (two mini charm packs; with plenty leftover to make some mug rugs or coasters)
NOTE: If you are using Sudoku for patchwork that is larger than 9 squares in Width or Height, simply repeat the Sudoku grid as far as is needed in either direction.
PERFECT PATCHWORK PLACEMATS, STEP BY STEP
These placemats make great gifts and come together really quickly. They’re perfect for trying out new machine quilting designs without committing to an entire quilt and also make for a fun hand quilting project to keep you creating, even when you can’t be at your machine.