math

what is a common denominator of 60, 100, 75, and 120

LCD=1

Prime factor each number and line like factors up in columns

60  =  2^2    * 3    * 5

100 = 2^2            * 5^2

75  =              3    * 5^2

120=  2^3   *  3    * 5

From each column, take the factor with the largest power and multiply these together......so we have :

2^3 * 3 * 5^2   = 

8 * 3 * 25 =

24  *  25  =

600

And that's the LCD

CPhill: Didn't you just calculate "LCM" instead of "LCD"?? Check here please:

http://www.calculatorsoup.com/calculators/math/lcm.php