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To cut the width of the blind to fit your window, first measure your windows for an inside mount, meaning inside the frame. Next, measure the width of your headrail. Subtract the window size from the headrail and then subtract an additional 1/4 inch. Divide that number by two. Take that answer and cut that amount from each end of the headrail using a saw or tinsnips. Next, pull up the blinds and use tape to secure the ends together evenly. Measure and draw a line representing the amount you wish to cut and cut slowly using a saw. Repeat on other side. Be sure to use safety precautions when using this type of equipment.
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In Answers.com you can use the little x2 button on the window.
328/7= 46.857142857142857142857142857143 Just use your Windows Calculator