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100 (also written as one hundred) is the natural number after 99 and before 101. It is the first three-digit number above zero. The number 100 is an abundant number. The letter C is the old Roman numeral for 100.

← 99 100 101 →
Cardinalone hundred
Ordinal100th
(one hundredth)
Factorization22× 52
Greek numeralΡ´
Roman numeralC
Binary11001002
Ternary102013
Quaternary12104
Quinary4005
Senary2446
Octal1448
Duodecimal8412
Hexadecimal6416
Vigesimal5020
Base 362S36

UsageEdit

100 m running competition.

In binary and bcd -code, 100 means number four.