The Split Quarter Square Triangle

Like the quarter square triangle, the split quarter square triangle is a quilting block with many uses. It is a frugal, easy to construct block. It is used to make many different blocks. It is one of the most popular basic building blocks.

On this page we are going to use simple measurements, and make a block that is 6 1/2 inches raw, or 6 inches finished. 

Review the information on how to make quarter square triangles.  You begin by cutting 2 squares. Use a dark and light fabric. Cut them 7 1/4 inches raw ( We added 1 1/4 inches to the finished block size. Review the quarter square triangles page for that measurement).

Press a diagonal fold on the white fabric.

Sew 1/4 inch on both sides of the line.  Cut down the center, press the block open, and trim off the bunny ears.

The next step is the difference.  When you made a quarter square triangle you put the blocks just just constructed right sides together.

For the second step in making the split quarter square triangle, you will be cutting a new square and placing it right sides together with the half square triangle just made.

On the half square triangle page you were told that when you make a triangle you lose 3/8 of an inch.  If you measure the block you just made, it will be 6 7/8 raw.  Cut your new square 6 7/8 inches.  Choose a medium to dark fabric.

Do the step above again, sewing on both sides of the diagonal line.  When you are done, cut and press, you will have the unit pictured at the top of the page.

Here are some of the designs you can make with this block.  Be aware that when you make this block with 2 squares, you are making mirror pieces.  As you can see, this block can be used to make a 9 patch star.