The things that you will need is a ruler, 1/4 inch sewing machine foot (or a mark on your machine), a washable fabric pen, and scissors.
To get started cut your strips but make sure to add the extra on both ends. I explain the math in the video, so watch it and you will understand. Another way, is to cut the sashing, sew them together in one long line and then just sew it on, and cut it when you come to the end of each side.
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Thanks For Watching,