280 in words
280
two hundred and eighty
280 is written two hundred and eighty.
Ways to write it
- As an ordinal
- two hundred and eightieth
- Roman numeral
- CCLXXX
- Expanded form
- 200 + 80
Place value
| Place | Digit | Value |
|---|---|---|
| hundreds | 2 | 200 |
| tens | 8 | 80 |
| ones | 0 | 0 |
Number facts
- Even or odd
- Even
- Prime or composite
- Composite
- Factors
- 1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140 and 280 (16 factors)
- First 10 multiples
- 280, 560, 840, 1,120, 1,400, 1,680, 1,960, 2,240, 2,520, 2,800
- Square
- 280 × 280 = 78,400
- Square root
- ≈ 16.73
- Sum of the digits
- 2 + 8 + 0 = 10
- Rounded to the nearest 10
- 280
- Rounded to the nearest 100
- 300
- Number before
- 279
- Number after
- 281
- In binary
100011000
Quick check
What number comes just after 280?
Show the answer
281
Is 280 even or odd?
Show the answer
Even
What is 280 + 10?
Show the answer
290
Practise with a game
Factors, Multiples & Primes
Multiples, factors, prime numbers, square numbers and prime factors.
Roman Numerals
Read and write Roman numerals from I to 3,999.Frequently asked questions
How do you write 280 in words?
280 is written "two hundred and eighty".
Is 280 a prime number?
No. 280 is a composite number, because it has more than two factors.
What are the factors of 280?
The factors of 280 are 1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140 and 280.
How do you write 280 in Roman numerals?
280 in Roman numerals is CCLXXX.