Add/Subtract Miles, Kilometers, Furlongs, Yards, Feet, Inches12 inches === 1 foot
The decimal measuring system uses 100 to advance from centimeters to Meters and 1,000 to advance to Kilometers. The process of adding and subtracting lengths uses a multibase system of 12, 3, 220, 5 and 1.6 to move from inches through miles. To do a calculation follow the following steps :
See also : Multiply/Divide Time 

