how do you find the common denomanator of a fraction question

Question

The question is about fractions and i need to know how to find the common denomator

Answer 1

Look at what common number the denominators both divide into. For example if your denominators were 2 and 3. Your common denominator would be 6. Because 6 is the smallest number that BOTH 2 and 3 divide into. 12 would also be a common denominator but you alsways want to use the smallest common denominator. Here are a couple of other examples

1.) 4,5 LCM = 20

2.) 6,12 LCM = 12

3) 5x^2, 8x LCM = 8x