[I forgot to take a full picture with the wooden dowels in]
In the paint department at Lowes, I got a package of drop cloth. There are a few kinds and sizes to choose from, ranging $10 and up. This particular one I got is a heavy weight, and was about $19:
I unrolled it and cut a strip out, following the fold line:
It is about 12" x 58":
I used Fray Check on all sides:
It will dry clear:
Snip off the long ends:
I also got a wooden dowel at Lowes for $1. I used a saw and cut it down to about 1.5 inches longer than the width:
At the top and bottom of the chart, I folded and sew a straight line across, making a little pocket for the wooden dowel to go through:
I used my yard stick, measured and drew the lines with a black Sharpie:
I free-handed the numbers with a pencil:
Used black acrylic paint to fill them in:
Put the two dowels in:
For hanging, I used twine/rope, wrapped it around the ends of the top dowel, and tied a knot:
Good luck!
=)