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| Method with the Long Sides of the Triangles on the Grain: |
 In this method, we also draw a pattern of squares on the back of one of the fabric pieces we’re using for the triangles. The squares should be larger than the final blocks because we need the seam allowance. Calculate the size of the squares as follows:
We’re referring to the size indicated by the blue arrow in the image. Since the squares are square, the same size applies to the other side of the squares. |
 Draw diagonals through the squares, two per square. These will be your cutting lines. The cutting lines are shown in blue in the image. Draw a line exactly 1/4 inch on the inside of the sides. Do this on all sides. These are the sewing lines. Place both fabric pieces with the right sides together, and the piece with the drawn pattern on top. Sew the fabric pieces together on the sewing lines. All the sewing lines are shown in red in the images. You don’t need to start and stop at each line. You can sew continuously since it’s a square.If you’re working in centimeters, draw a line 1/2 cm on the inside of the straight sides. |
 Once all the sewing lines are stitched, you can cut out the block along the outer edges through both layers of fabric. You don’t need to add extra seam allowance; it’s already included in your block. |
 Now you can cut out the triangles. Cut as precisely as possible along the blue diagonal lines. Each drawn square ultimately yields four blocks. |
 Now you only need to press your triangles. If you need more than the 4 blocks from this example, you can, of course, draw more squares. For example, if you need 16 blocks, calculate the number of blocks as follows:16/4 = 4 squares. 4 is 2 times 2. So you can draw a large block of 2 by 2 squares. |