Kirill Z. answered • 11/18/13

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Kirill Z. answered • 11/18/13

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Physics, math tutor with great knowledge and teaching skills

Jason S. answered • 11/18/13

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My goal is the success of my students. Knowledge-Patience-Honesty

I guess they want a little explanation:

The common denominator is the least common multiple (LCM).

First, factor everything down to the prime factorization of each number.

9 = 3 * 3 = 3^{2}

11 = 1 * 11

4 = 2 * 2 = 2^{2}

Then you take the highest power of each unique factor:

(2*2) * (3*3) * 11 = 396

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