All ancient civilizations wrestled with time and breaking the day into parts. The Romans used sundials borrowed from the Egyptians and split the daylight hours into 12 parts. The choice of 12 allowed them to work with halves, quarters, thirds, sixths, and twelfths. This convention is, of course, still in use today. Work with minutes and hours, taken together, show some basic fractions such as 1/2, 1/3, 1/4, 1/5 and 1/6, as shown with the downloadable fraction circles below.
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