The lcm of two numbers ist their least common multiple, i.e. the smallest number divisible by both numbers.
What is the lcm needed for?
For example if you put two fractions on the same denominator. The smallest possible denominator of those fractions is the lcm of the denominators.
For example, lets compare
and
. At first, it is not clear which fraction is larger. But the lcm of
and
is
, so it is possible to put the fractions on the common denominator
:
and
.
Now it is easily seen that
is smaller than
.
lcm - least common multiple
This calculator finds the lcm of two numbers. Just enter your numbers and get the lcm.