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11 in words

11

eleven

11 is written eleven.

Ways to write it

As an ordinal: eleventh
Roman numeral: XI
Expanded form: 10 + 1

Place value

Place	Digit	Value
tens	1	10
ones	1	1

Number facts

Even or odd: Odd
Prime or composite: Prime
Factors: 1 and 11 (2 factors)
First 10 multiples: 11, 22, 33, 44, 55, 66, 77, 88, 99, 110
Square: 11 × 11 = 121
Square root: ≈ 3.32
Sum of the digits: 1 + 1 = 2
Rounded to the nearest 10: 10
Number before: 10
Number after: 12
In binary: 1011

Quick check

What number comes just after 11?
Show the answer
12
Is 11 even or odd?
Show the answer
Odd
What is 11 + 10?
Show the answer
21

Practise with a game

Count with Me

Count pictures up to 5, 10 or 20 and compare groups.

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 11 in words?

11 is written "eleven".

Is 11 a prime number?

Yes. 11 is a prime number: its only factors are 1 and 11.

What are the factors of 11?

The factors of 11 are 1 and 11.

How do you write 11 in Roman numerals?

11 in Roman numerals is XI.