100 in words
100
one hundred
100 is written one hundred.
Ways to write it
- As an ordinal
- one hundredth
- Roman numeral
- C
- Expanded form
- 100
Place value
| Place | Digit | Value |
|---|---|---|
| hundreds | 1 | 100 |
| tens | 0 | 0 |
| ones | 0 | 0 |
Number facts
- Even or odd
- Even
- Prime or composite
- Composite
- Factors
- 1, 2, 4, 5, 10, 20, 25, 50 and 100 (9 factors)
- First 10 multiples
- 100, 200, 300, 400, 500, 600, 700, 800, 900, 1,000
- Square
- 100 × 100 = 10,000
- Square root
- 10
- Sum of the digits
- 1 + 0 + 0 = 1
- Rounded to the nearest 10
- 100
- Rounded to the nearest 100
- 100
- Number before
- 99
- Number after
- 101
- In binary
1100100
Quick check
What number comes just after 100?
Show the answer
101
Is 100 even or odd?
Show the answer
Even
What is 100 + 10?
Show the answer
110
Practise with a game
Place Value Quest
Ones, tens, hundreds and thousands.
Times Tables Challenge
Practise any times table from 2× to 12×.Frequently asked questions
How do you write 100 in words?
100 is written "one hundred".
Is 100 a prime number?
No. 100 is a composite number, because it has more than two factors.
What are the factors of 100?
The factors of 100 are 1, 2, 4, 5, 10, 20, 25, 50 and 100.
How do you write 100 in Roman numerals?
100 in Roman numerals is C.