100

100 is a natural number that follows 99 and precedes 101. In the decimal system it is written as 100. It is an even composite number, with prime factorization 2^2 × 5^2, and equals 10 squared (10^2).

Roman numerals designate it as C. The Latin root centum means "hundred." In the metric system the prefix centi- means one hundredth, while cent- forms words such as century and centennial to refer to a hundred.

Mathematically, 100 is 10^2 and a common base for percentages: 100% represents the whole. It is used as a round reference value in measurement and statistics.

Cultural and historical usage includes the term century for a period of 100 years; a hundredth anniversary is centennial. Notable uses include the Hundred Years' War and the slang "C-note" for a 100-dollar bill.

Other uses include 100 degrees Celsius as the boiling point of water at standard pressure. In computing and networking, HTTP status code 100 Continue. In science, the element with atomic number 100 is Fermium (Fm).