Practice and Review
The earliest known system of linear measurement is the Egyptian Royal Cubit, was accurately enforced from at least the time of the pharaoh Djoser in 270B.C. The common cubit was the length of the forearm from the elbow to the tip of the middle finger. It was divided into the span of the hand (one-half cubit), the palm or width of the hand (one sixth), and the digit or width of the middle finger (one twenty-fourth) and the span or the length between the tip little finger to the tip of the thumb. The Sacred Cubit, which was a standard cubit in addition to an extra span—in other words, 7 spans or 28 digits long—was used to construct buildings and monuments as well as for surveying; it may have been based on an astronomical measurement. The inch, foot, and yard evolved from these units although no one is entirely sure just how the transformation took place.

To convert centigrade or celcius to Fahrenheit, multiply the centigrade temperature by nine and then divide the product by five. After you do that add 32 degrees to the total. See the formula below:

Some say they evolved from cubic measures while others believe they were simple proportions or multiples of the cubit. What is known is that the Greeks and Romans inherited the foot from the Egyptians. The Roman foot (~296 mm) was divided into both 12 unciae (inches) (~24.7 mm) and 16 digits (~18.5 mm). The Romans also introduced the mille passus (1000 paces) or double steps, the pace being equal to five Roman feet (~1480 mm). The Roman mile of 5000 feet (1480 m) was introduced into England during the occupation. Queen Elizabeth I changed the mile to 5280 feet (~1609 m) or 8 furlongs, a furlong being 40 rod (unit)s (~201 m) of 5.5 yards (~5.03 m)each. The introduction of the yard (0.9144 m) as a unit of length came later, but its origin is not definitely known.