Question

What is the Least Common Denominator (LCD) of eleven-fourteenths and sixteen twenty-firsts?

7

fourteen

thirty-two

forty-two

Answer 1

I'm a little confused on what the question is asking for. Looking at the problem, there is no choice that both 16 and 11 go in, so I am going to disregard the numerator.

Looking at the denominator, I can see that 7 is the least common denominator that goes into both 14 and 21. I would say that 7 is your answer.

Answer 2

The "Least Common Denominator" is the smallest number that can be used for all denominators of 2 or more fractions.

Example: the Least Common Denominator of 1/2 and 2/3 is 6, because they can be written as 3/6 and 4/6.

http://www.mathsisfun.com/definitions/least-common-denominator.html

Answer 3

But the answer is 7 because it is the smallest number between 21 and 14

Answer 4

Thanks Guys

Answer 5

14 has prime factors of 2*7
21 has prime factors of 3*7

So, your LCD is 2*3*7 = 42. -->

Answer 6

Oh okay that's interesting. Even I learned something :)

Answer 7

@KirbyLegs

7 is the greatest common factor of 14 and 21