The original Pinterest pin I stole it from is here which includes the math for different size blocks.
|Sew (4) 5" squares together and spiral the center seam.|
|Use your favorite pencil to mark 2" to the side of each corner, for a total of 8 marks.|
|Without moving the fabric, cut 4 diagonal lines from mark to mark made in the previous photo.|
You can barely make out the cut lines above - 2 from purple to purple block and 2 from striped to strip.
|This is the fun step!|
Move all the triangles one place to the right and rotate the center square a quarter turn.
|Since my cutting mat is not on my sewing machine table, |
I place all the bits and parts on a square ruler to move them to the sewing machine.
|Essentially we are now working with a 9 patch.|
Sew the 9 parts in to 3 rows and then sew the rows together.
|Becasue of the angles, you'll need to square up your block.|
|My blocks have been 7.5" unfinished.|
Hopefully that was clearer than mud but let me know if you have questions and I would love to see what blocks you make :)