a proper fraction whose denominator is a power of 10
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Learn these words relating to pi, the mathematical constant and the 16th letter of the Greek alphabet. Pi Day is celebrated on March 14th, or 3/14, the date that corresponds to the first (and most well-known) digits in the decimal form of Pi.
These words derive from the Latin roots dec ("ten"), cent ("hundred"), and mille ("thousand"). Start a practice session and see if you can score 100 percent!