345 in words
345
three hundred and forty-five
345 is written three hundred and forty-five.
Ways to write it
- As an ordinal
- three hundred and forty-fifth
- Roman numeral
- CCCXLV
- Expanded form
- 300 + 40 + 5
Place value
| Place | Digit | Value |
|---|---|---|
| hundreds | 3 | 300 |
| tens | 4 | 40 |
| ones | 5 | 5 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 3, 5, 15, 23, 69, 115 and 345 (8 factors)
- First 10 multiples
- 345, 690, 1,035, 1,380, 1,725, 2,070, 2,415, 2,760, 3,105, 3,450
- Square
- 345 × 345 = 119,025
- Square root
- ≈ 18.57
- Sum of the digits
- 3 + 4 + 5 = 12
- Rounded to the nearest 10
- 350
- Rounded to the nearest 100
- 300
- Number before
- 344
- Number after
- 346
- In binary
101011001
Quick check
What number comes just after 345?
Show the answer
346
Is 345 even or odd?
Show the answer
Odd
What is 345 + 10?
Show the answer
355
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 345 in words?
345 is written "three hundred and forty-five".
Is 345 a prime number?
No. 345 is a composite number, because it has more than two factors.
What are the factors of 345?
The factors of 345 are 1, 3, 5, 15, 23, 69, 115 and 345.
How do you write 345 in Roman numerals?
345 in Roman numerals is CCCXLV.