How to Make Half-Square Triangle Quilt Blocks (Method 2 — no marking) – New Quilters

Here’s a quick way to make four half-square triangle quilt blocks from two fabric squares.

Start with two same-size squares. Mine were 10″, the size square that comes in layer cake precut packages.

Lay the squares with right sides together. Carefully align the edges and corners. Photo of two fabric squares with right sides togetherSew all around the outside of the squares, using a scant 1/4 seam allowance.Diagram of seam sewed around fabric squaresUse your rotary cutter and ruler to cut the squares in half diagonally in both directions.Diagram showing fabric square cut into four pieces

Photo of roatry cutter, ruler, and fabric squares.You will have four triangle blocks.Photo of four cut triangle blocksPress the seam allowances to the side of the darker fabric. You will get four identical triangle blocks with little tails at two corners.Photo of four triangle blocks with steam iron Use a square ruler (if you have one) to trim off the tails and if necessary, trim the block down to the exact size you want. My squares were 6-3/4″, so I trimmed them down to a more useful 6-1/2″.


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Christine Mann

Christine Mann is one of the founders of the New Quilters blog. She likes to make quilts for family and friends. She shares her quilting room with her bad dog, Marcus.


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