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Three Strips Quilt Block Pattern

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Sewing a three strip quilt block is a simple and quick way to make a quilt top. Here are the steps to sew a basic three strip quilt block:

Materials needed:

  • Fabric strips in three different colors measuring 2.5 inches wide and at least 16 inches long
  • Sewing machine
  • Thread
  • Scissors
  • Iron and ironing board


  1. Choose three different fabric strips in colors that you want to use for your quilt block.
  2. Lay the three strips right sides together with one strip of each color on top of the other.
  3. Sew a 1/4 inch seam along one long edge of the strips using a sewing machine.
  4. Press the seams open with an iron.
  5. Lay the sewn strip flat on the cutting mat with the seam allowances facing up.
  6. Cut the strip into three pieces, each measuring 5.5 inches.
  7. Flip the middle piece around so that the colors alternate on each side of the center piece.
  8. Sew the three pieces together by placing the outer pieces right sides together with the center piece.
  9. Sew a 1/4 inch seam along each long edge of the block, making sure to match the seams.
  10. Press the seams open with an iron.

Congratulations! You have now sewn a basic three strip quilt block. Repeat these steps to create more blocks, and then join them together to create a larger quilt top.



How to Resize Quilt Blocks:

The first step in modifying any quilt block is to decide on the size of your finished quilt block. You can come to a decision based on a number of factors: doubling a pattern, cutting your pattern in half, or choosing the size based on your available fabric.

NOTE: When working from a pattern’s cutting instructions, make sure you remove the seam allowance before doubling or tripling the size. For instance, if your pattern calls for 3-1/2″ squares, first you’ll subtract the sum of the seam allowances (1/2″), double the finished block size (from 3″ to 6″), and add the seam allowance back in (1/2″). So, when all is said and done, you will cut a 6-1/2″ piece of fabric.

Resizing Square Blocks:

Square blocks are the easiest to resize. Simply add to your finished block measurement. For example, if you’d like your finished block to be a 4″ square, you’ll need to cut a 4-1/2″ square of fabric.

Resizing Rectangular Blocks:

Similarly to the square, for rectangle blocks, you’ll add to the length and width measurements of your finished block. If you’re doubling block that measures 3″ x 4″ in your quilt, you’ll cut a 6-1/2″ x 8-1/2″ rectangle of fabric.

Resizing Half-Square Triangle Blocks:

When you want to change the size of a Half-Square Triangle block, add 7/8″ to the desired finished block size. To make a 4″ finished block, you’d cut 4-7/8″ squares.

Resizing Quarter Square Triangle:

Since there are two cut lines and two seam lines in a Quarter-Square Triangle block you’ll need to add 1-1/4″ to the desired finished block size. For a finished block that’s 4″, you’d cut your squares 5-1/4″.

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