Number reference
100 explained.
100: one hundred, composite, power of ten; factors, prime factorization, roots, binary, hexadecimal, and digit properties.
Identity and representations
- Written form
- one hundred
- Classification
- composite
- Factors
- 1, 2, 4, 5, 10, 20, 25, 50, 100
- Prime factorization
- 2 × 2 × 5 × 5
- Square root
- 10
- Cube root
- 4.641589
- Binary
- 1100100
- Octal
- 144
- Hexadecimal
- 64
- Roman numeral
- C
- Digit sum
- 1
- Digital root
- 1
What makes 100 notable
- Power of ten. 100 = 10^2, so shifting a decimal point by 2 places multiplies or divides by it.
- Perfect square. 100 = 10², so a square of side 10 has an area of 100.
100 in everyday use
One hundred is the base of percentage: "per cent" means "per hundred", so every percentage is a comparison against this number.
Nearby numbers
How to read this page
The factor list shows every way 100 splits into equal whole-number groups — 9 divisors in total. The prime factorisation is the compact form of that same information, and the base conversions restate 100 for contexts that do not use decimal.
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