1. Measure all three aspects--the length, width and height--of an object to get a three-dimensional measurement. Continuing the example above, the 3 foot x 4 foot rectangle is the side of a box that has a length of 5 feet, so the dimensions are expressed as 3 ft. (width) x 4 ft. (height) x 5 ft.
2. Board footage is calculated by multiplying the nominal thickness in inches (T) by the nominal width in inches (W) by the actual length in feet (L) and dividing by 12. The formula is: T x W x L = Board ft.
3. Knowing the units of measurement that correspond with a number can give you so much more information than a digit sitting there by itself. Units can: Help to show another person the exact amount you have. Show which measurement system the person is using (i.e. metric or standard)
4. Every fraction can also be written as a decimal, and vice versa. You may not do this very often, but converting decimals and fractions can help you in math. For example, it's easier to subtract 1/6 from 0.52 if you turn 1/6 into a decimal first.

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