The Square in a Star Quilting Block
The Square in a Star quilt block is a 4 patch block, which can be further divided into 16 units.
This is not a hard block to make. It is just like the Sawtooth star block, except the center block has been replaced with a 9 patch unit.
As you can see from the picture, the center square takes up 2 units. That means that it needs to finish at 4 inches. In order for it to finish at 4 inches, the 9 patch must be pieced so that it comes out at 4 1/2 inches raw.
Here is where you have to do a little math to get the size of the strips of squares for the center unit. 4 1/2 inches raw, plus the 2 seams in the 9 patch is equal to 5 1/2 inches raw. Divide that by 3, and you get 1.83. Round that off to the higher measurement on your ruler, and it is 1 7/8 inches.
If you cut 3 strips 1 7/8 and join them, after taking away an inch for the seams, you have a raw width measurement of 5.625. That is as close as you can get. You want your block to finish at 5 1/2 inches. After you get it made, you can just sliver cut the edges to make it exact.
The 9 patch in the center of this block could be replaced with a 4 patch. The math on that would be easy. The squares or strips would be cut 2 1/2 inches raw. (2 1/2 plus 2 1/2 is equal to 5 inches. Take away the one seam, and you have a raw 4 1/2 inches).
Another option is to put a large print or fussy cut in the center block. This is a great way to highlight a special fabric.
This is a versatile, frugal block. It can be made scrappy, from leftover bits of fabric. Have some fun with this one.