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9 in words

9

nine

9 is written nine.

Ways to write it

As an ordinal: ninth
Roman numeral: IX

Place value

Place	Digit	Value
ones	9	9

Number facts

Even or odd: Odd
Prime or composite: Composite
Factors: 1, 3 and 9 (3 factors)
First 10 multiples: 9, 18, 27, 36, 45, 54, 63, 72, 81, 90
Square: 9 × 9 = 81
Square root: 3
Rounded to the nearest 10: 10
Number before: 8
Number after: 10
In binary: 1001

Quick check

What number comes just after 9?
Show the answer
10
Is 9 even or odd?
Show the answer
Odd
What is 9 + 10?
Show the answer
19

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 9 in words?

9 is written "nine".

Is 9 a prime number?

No. 9 is a composite number, because it has more than two factors.

What are the factors of 9?

The factors of 9 are 1, 3 and 9.

How do you write 9 in Roman numerals?

9 in Roman numerals is IX.