The least common multiple of two numbers is the smallest number both divide into evenly. It is what you need when adding fractions with different denominators, because it gives the smallest common denominator available.
Math Dictionary / Least Common Multiple
Least Common Multiple
The least common multiple is the smallest positive multiple shared by two or more numbers.
Number SystemGrade 5Grade 6Grade 7GED
What it means
It is often used to find a common denominator.
Also called: LCM
Examples
| LCM of 4 and 6 is 12 |
| LCM of 3 and 5 is 15 |
| A common denominator can be an LCM |
Common mistake
The least common multiple is a multiple, not a factor.
Try one
Question: What is the LCM of 6 and 8?
Show answer
24.