Mystery Quilt 2020 – Block 4

How are you doing? I hope you’re having lots of fun working on these Mystery blocks!

We are ready for our Fourth Block, with this one we are going to learn how to make quarter-square triangles (QST) and one of my favorite star blocks – an Ohio Star!

Quarter Square Triangles (QST) are created by cutting a square twice diagonally which will produce 4 triangles. Please watch our Block 4 YouTube Video for tips and cutting this block.

For Block 4, you will need: (choose the fabrics shown above from your Super Bloom bundle)

1. 10″ pink square

2. 10″ x 21″ pink rectangle

3. Fat quarter light fabric

We will be making 8 blocks. The cutting directions are listed below:

1. 64 light quarter-square triangles cut from 16 squares 3-1/4″

2. 64 pink quarter-square triangles cut from 16 squares 3-1/4″

3. 32 light squares 2-1/2″

4. 8 pink squares 2-1/2″

Join two pink QST and two light QST (see details below)

I like to put my light triangle on one side and the pink on the other.

Then use “chain sewing” technique to sew all triangles for the block. Note: I use a scant 1/4″ seam allowance when sewing my QST units, this will allow me to trim them later.

Cut the treads holding the string of triangles together, open triangles, and press your seam allowance toward the pink. Be careful not to stretch the bias edge when pressing.

Take two units and arrange them as shown above.

Place them right sides together, nest the center seam and pin.

Sew triangle units together, again using a scant 1/4″ seam allowance.

Gently open seam allowance on center back, press and trim using your ruler to 2-1/2″ x 2-1/2″ square.

Arrange 4 light squares, 1 pink square, and 4 quarter square triangle units as shown.

Sew into rows using a regular 1/4″ seam allowance.

Sew rows together and press your block.

Finally square your blocks to 6-1/2″, I love using my 6-1/2″ Creative Grids ruler and OLFA Spinning Mat to trim these blocks.

Repeat until you have completed 8 Mystery Quilt Block 4s.

Our fourth blocks will be positioned as shown above in our Mystery quilt!

While the Mystery Quilt has been keeping us busy, I can’t help but think what I am going to do next and use up more of my scraps…

Click here to download a PDF copy of Mystery quilt 2020 Block 4

Visit our website for the California Pattern.

Happy Quilting! Edyta Sitar