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30 in words

30

thirty

30 is written thirty.

Ways to write it

As an ordinal: thirtieth
Roman numeral: XXX
Expanded form: 30

Place value

Place	Digit	Value
tens	3	30
ones	0	0

Number facts

Even or odd: Even
Prime or composite: Composite
Factors: 1, 2, 3, 5, 6, 10, 15 and 30 (8 factors)
First 10 multiples: 30, 60, 90, 120, 150, 180, 210, 240, 270, 300
Square: 30 × 30 = 900
Square root: ≈ 5.48
Sum of the digits: 3 + 0 = 3
Rounded to the nearest 10: 30
Number before: 29
Number after: 31
In binary: 11110

Quick check

What number comes just after 30?
Show the answer
31
Is 30 even or odd?
Show the answer
Even
What is 30 + 10?
Show the answer
40

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 30 in words?

30 is written "thirty".

Is 30 a prime number?

No. 30 is a composite number, because it has more than two factors.

What are the factors of 30?

The factors of 30 are 1, 2, 3, 5, 6, 10, 15 and 30.

How do you write 30 in Roman numerals?

30 in Roman numerals is XXX.