Rewrite 5 16 + 6 20 with a common denominator.

Hi there! So, we will find the LCD by finding the LCM of both mulitples, which is the lowests number that both of them have in common when being mulitplied by a number. Let's list them out.

16: 16, 32, 48, 64, 18
20: 20, 40, 60, 80, 100

As we can see, they both have the number 80 in common. That number will be our LCD. Let's convert. 16 goes into 80 five times and 5 * 5 is 80. 5/16 is 25/80. 20 goes into 80 four times and 6 * 4 is 24. That makes 24/80. The expression is 25/80 + 24/80. Add both of those numbers and the sum is 49/80.