Easy Half Square Triangles

Last week I showed you my Big Star Quilt made from layer cakes. In that lesson I used the Easy Half Square Triangle method for the first time. It was easy but I wanted to be able to apply it to more sizes. I saw a post that stated if you add 3.5″ to whatever size you wanted that would do the trick. But I didn’t find that to be exactly accurate.

When I sewed two 5″ squares together and cut them apart diagonally, I ended up with a 3″ half square triangle (HST). So that meant from 5″ squares I could get 1.5″ & 2.5″ HST.

When I sewed two 7″ squares together and cut them apart diagonally, I ended up with a 4.5″ HST. So that meant from 7″ squares I could get 3.5″ & 4.5″ HST.

When I sewed two 9″ squares together and cut them apart diagonally, I ended up with a 6″ HST. So that meant from 9″ squares I could get 5.5″ HST.

When I sewed two 10″ squares together and cut them apart diagonally, I ended up with a 6.75″ HST. So that meant from 10″ squares I could get 6.5 HST.

Easy Half Square Triangles
Choose your size square and sew all around the outside edges using a 1/4″ seam allowance.

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Cut diagonally,

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Cut diagonally again

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You now have 4 half square triangles.

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6.75″, 6″, 4.5″, 3″ HST

13 thoughts on “Easy Half Square Triangles

    1. ifthesethreadscouldtalk Post author

      It means, from 5″ squares you get 3″ half square triangles that you can square up to be either 1.5″ or 2.5″ half square triangles

      7″ squares produce 4.5″ half square triangles, so you can also square them up to get 3.5″ HST

      Etc, etc. does that help?

      Reply
      1. Naia

        I guess I feel a little stupid. If you have a 5″ square, sew all the way around it, cut it up – wouldn’t you have 2.5″ HSTs, not 3″?

        I get the pictures – not the math. I’m a practical application person so that would make sense. I see and can recreate. I can’t read it and understand it. Sets me apart from the ladies in the local quilt guild, too.

      2. ifthesethreadscouldtalk Post author

        If you take a 5″ square and measure across diagonally, it will measure 7″ . You should take two scraps, cut them into 5″ squares, sew right sides together all around the edges. Then cut them diagonally. You will understand then. I firmly believe there are no stupid questions.

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