MATH
posted by TREVAIN .
WHAT ARE THE LCM OF 16 AND 20

The greatest common factor is 4.
Multiply 16 * 20.
Divide that answer by 4.
This site shows that method plus another similar method.
http://www.aaamath.com/fra66ilcm.html 
...16 20

4  4 5
4  1 5
5  1 1
so LCM = 4x4x5 = 80