The Illinois quilt block pattern is another for my list of American states quilt block patterns. It’s an easy block to make and it is shown here as a 12″ block.
Cutting requirements for the Illinois quilt block pattern
4.7/8″ squares: two each in brown and white
4.1/2″ squares: one white
2.7/8″ squares: eight each in brown and white
Making the Illinois quilt block
Use the 4.7/8″ and the 2.7/8″ squares to make half square triangle units. Place two squares with right sides together and mark a line along the diagonal. Sew a 1/4″ seam either side of the marked line and cut along the line to produce two half square triangle units. Press the seam allowance towards the darker fabric and trim the corners of the squares.
Lay the patchwork squares out as shown. The Illinois quilt block is classified as a nine patch block but the layout is not completely straightforward because the squares are two different sizes. The central white square and the corner large half square triangles are all 4.1/2″ squares, so the first thing to do is sew the small half square triangles together first in pairs and then fours to make them into 4.1/2″ squares.
Note that all these half square triangles are placed so that the brown triangles are placed together to form a larger brown triangle pointing away from the middle.
Finally you have just three squares in each row: sew the squares together across each row and then sew the rows to each other to complete the Illinois quilt block pattern.
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