100 in Binary = 4 in Decimal

100 in binary is 4 in decimal, IV in Roman numerals, 4 in hexadecimal and 4 in octal.

From To 4

100 binary = 4 decimal

100 in every number system

System	Written as
Decimal (base 10)	`4`
Roman numerals	`IV`
Hexadecimal (base 16)	`4`
Octal (base 8)	`4`
Duodecimal (base 12)	`4`
Ternary (base 3)	`11`
Base 36	`4`
Vigesimal (base 20)	`4`
Quaternary (base 4)	`10`
Quinary (base 5)	`4`
Senary (base 6)	`4`

How to read 100 in binary

Binary to decimal

Multiply each digit by 2 to the power of its position (0 on the right), then add:

Digit	Place value	Digit × place
`1`	2² = 4	4
`0`	2¹ = 2	0
`0`	2⁰ = 1	0

4 + 0 + 0 = 4

About the number 4

4 is an even number.
4 is not a prime number.
4 is a power of two: 2².
4 is a perfect square: 2 × 2.
Written in binary it needs 3 bits, so it fits in one byte.

Nearby numbers in binary