eighty

Eighty is the cardinal number that comes after seventy-nine and before eighty-one. It is represented by the numeral 80 in the decimal system. In English, the number eighty is typically spelled out as "eighty" or "eight-zero" in contexts where clarity is needed, such as in dates or phone numbers. The number eighty is significant in various cultural, historical, and mathematical contexts.

In mathematics, eighty is a composite number, meaning it has divisors other than one and itself. It is an even number and is divisible by 2, 4, 5, 8, 10, 16, and 20. The number eighty is also a perfect square, specifically the square of the number eight (8 x 8 = 64). In the context of time, eighty is used to denote the number of years in a century, as well as the number of weeks in approximately one and a half years.

Historically, the number eighty has been used in various cultural and religious contexts. For example, in the Bible, the number eighty is mentioned in the context of the life of Methuselah, who is said to have lived for 969 years, with eighty being a significant part of his lifespan. In modern times, the number eighty is often used in various contexts, such as in sports, where it may refer to the number of points in a game or the number of players on a team.