Slant-Ruler Board Divider
Want to divide a board or sheet of plywood perfectly in half, thirds or any other equal fractions? Here's a great old tip that's worth revisiting. To halve the board, line up the end of a ruler or tape measure on one side, slant the tape to read 8 in. on the right edge and make your mark at 4 in. To divide it into thirds, slant the ruler to read 9 in. and mark the board at 3 and 6 in.
The key is to select a measurement that's easily divisible by the number of spaces you want. For example, if you want to cut a sheet of plywood into six sections, use the 60-in. mark on your tape measure.
Measure at a 90-degree angle from one side to each mark to get the real numbers to transfer them wherever you need them.