A twin-size quilt typically measures around 68 inches by 88 inches, although exact dimensions can vary slightly depending on personal preference and design.

The number of squares you can cut from a given amount of fabric depends on the size of the squares you want to cut and the width of the fabric. For example, if you have a yard of fabric (which is 36 inches long), and you want to cut 5-inch squares, you could cut approximately 7 squares across (36 divided by 5 equals 7.2, rounded down) and 5 squares down, yielding a total of around 35 squares from that yard of fabric.

Sewing a mitered border involves folding and sewing the border fabric at a 45-degree angle to create a neat, diagonal seam at each corner. The best way to sew a mitered border is to carefully measure and mark where the corners of the border will meet, then fold the border fabric at a 45-degree angle and sew along the marked line. Trim any excess fabric, press the seam open, and repeat for each corner.

Bias binding is made by cutting strips of fabric on the bias (at a 45-degree angle to the selvage) and then sewing the strips together to create a long continuous piece. The strips are then folded and pressed in half lengthwise to create double-fold bias binding, which is commonly used to finish the edges of quilts. To make bias binding, you can use a bias tape maker tool to help fold the strips evenly and accurately.

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