IXL | Least common denominator

What
is
the
least
common
denominator
of
5
8
and
2
7
?

ref_doc_title.

Learn with an example

question

What
is
the
least
common
denominator
of
5
6
and
6
7
?

key idea

The least common denominator is the least common multiple of the denominators.

solution

The denominators are 6 and 7. Find the least common multiple of 6 and 7.

List the multiples of each number. Find the smallest number that appears in both lists.

Multiples of 6:	6, 12, 18, 24, 30, 36, 42
Multiples of 7:	7, 14, 21, 28, 35, 42

The least common multiple of 6 and 7 is 42.

The least common denominator of

is 42.

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Lesson: Least common denominator

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Teacher tools

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Not feeling ready yet? These can help:

F.7Least common multiple

J.2Equivalent fractions

Lesson: Least common denominator

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