Quilting Basics: Half Square Triangles – 8 at a time

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Half Square Triangles

Round 2 of Half-Square Triangles. This time we’re making 8 from 2 squares. I was looking at the 4 at a time method, and realized I should skip that one because the finished edges of the HST would be on a bias. Which means it would stretch all weird when it was being sewn. And can you imagine if you had a whole quilt cut that way??? Completely wonky!

So, we’re skipping the 4-at a time method, and going straight to 8. This is going to be fun!

At the bottom of the post is the formula to determine your own size and a link to a great chart on a fellow bloggers blog.

Half-Square Triangles

This particular method is called the “Magic 8″ method to create HST. It takes two squares, and by sewing 4 lines and making 4 cuts, you will have 8 half-square triangles.

Today I’m starting with 2 – 5” squares.

Half Square Triangles

Take the lighter of the two and draw two diagonals going from corner-to-corner.

Half Square Triangles

Lay both squares together, right sides together, and sew a 1/4″ on each side of the diagonal line.

Hint: you do not need to cut the thread at the corner, just lift the foot, rotate squares, and sew down the opposite side of the line.

Half Square Triangles

Next cut 4 times: corner to corner and in half on from side to side.

Half Square Triangles

Open and press toward darker fabric. And now you have 8 HST.

Half Square Triangles

Trim to 2″ square.Tip: when trimming, line up the diagonal line on your square with the diagonal on each of the HST.

Now that you have the basics for this block, it’s time to figure out how to adapt it to the size of HST triangles you want.

Decide what you want your finished size to be, add 7/8″, or .875. And then multiply that number by 2. And that’s the starting size of your square.

So, if you want a 5″ finished square, add 7/8″:

5 + .875 = 5.875

Then take that number and multiple it by 2:

5.875 x 2 = 11.75

Start with a 11.75″ square.

However, if you don’t want to do the calculations, this blog has a great chart that I like to reference. I like the way she shows how to trim the block, before the ironing. So smart!!! Only two cuts, instead of 4.