How To Add/Subtract Lengths
1. Enter in a length in one of three ways. For example, you may enter
    "Feet 2, Inches 6", or "Decimal Feet 2.5", or "Decimal Inches 30".
2. Press + or -
3. Enter another length
4. Repeat steps 2 and 3 as desired
5. Press =

How To Multiply/Divide A Length
1. Enter in a length in one of three ways. For example, you may enter
    "Feet 2, Inches 6", or "Decimal Feet 2.5", or "Decimal Inches 30".
2. Press / or X
3. Enter in a number in the Box next to / X
4. Press =

How To Convert Lengths
1. Enter in a length in one of three ways. For example, you may enter
    "Feet 2, Inches 6", or "Decimal Feet 2.5", or "Decimal Inches 30".
2. Press =