7.1.7 Step 5: Cutting the Matting
It might be difficult to find a ruler that measures thirds, but because two thirds is close to seven tenths, you could use this as an approximation. There are rulers that measure tenths, and you can find printable versions on the Internet, such as the ones on, where the ruler at the far left is marked in tenths.
The border on the right and bottom are too large. To finish cutting down the matting, you could measure inches down from the bottom and to the right of the inscribed rectangle you just cut out.
Before you do any cutting, you should check that the width of matting you propose to cut off is close to inches and the length is close to inches.