An easy way I like to make half square triangles is to start with two squares of different fabrics.
The size of the squares is the finished size of the half square triangle needed plus 7/8". Since the blocks will be trimmed you can just add 1" to the finished size.
Draw a diagonal line on the back of the lighter fabric and lay it on the darker fabric, right sides together - all the sides should be even. Stitch the two squares together, by sewing 1/4" away from the line, on both sides of the line.
Cut on the drawn line and press the seams to the dark fabric. The two squares results in two half square triangles (HST).
Trim the half square triangles to the needed size plus 1/2" for seam allowance. A square ruler is handy because you can line up the diagonal line to get even triangles when trimming.
I am working on some little blocks again.
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