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80 in words

80

eighty

80 is written eighty.

Ways to write it

As an ordinal: eightieth
Roman numeral: LXXX
Expanded form: 80

Place value

Place	Digit	Value
tens	8	80
ones	0	0

Number facts

Even or odd: Even
Prime or composite: Composite
Factors: 1, 2, 4, 5, 8, 10, 16, 20, 40 and 80 (10 factors)
First 10 multiples: 80, 160, 240, 320, 400, 480, 560, 640, 720, 800
Square: 80 × 80 = 6,400
Square root: ≈ 8.94
Sum of the digits: 8 + 0 = 8
Rounded to the nearest 10: 80
Number before: 79
Number after: 81
In binary: 1010000

Quick check

What number comes just after 80?
Show the answer
81
Is 80 even or odd?
Show the answer
Even
What is 80 + 10?
Show the answer
90

Practise with a game

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Times Tables Challenge

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Frequently asked questions

How do you write 80 in words?

80 is written "eighty".

Is 80 a prime number?

No. 80 is a composite number, because it has more than two factors.

What are the factors of 80?

The factors of 80 are 1, 2, 4, 5, 8, 10, 16, 20, 40 and 80.

How do you write 80 in Roman numerals?

80 in Roman numerals is LXXX.