Fractions FINALLY Click | Adding Fractions With Unlike Denominators (Part 3)

Added: 2026-05-20

[00:00:00]Hey guys, it's Mr. Bell. And today, I'm going to show you how to add fractions with unlike denominators. Let's do it.

[00:00:07]Here we have 4/9 + 7/6. Whenever you're adding fractions, you want to look at your denominators first. You want to ask yourself this question. Are denominators the same? They're not. Since they're not the same, we can't add this fraction yet. We need to look for a least common denominator between our fractions before we can add it. Let's do that by taking our denominator 9 and our denominator 6 and doing our multiples.

[00:00:30]And we're going to look for our least common multiple. That's our least common denominator. Let's do it. Let's do 9. We got 9, 18, 27. Then 6, we got 6, 12, 18.

[00:00:44]Now that we've done our multiples, let's look at our multiples between 9 and 6.

[00:00:48]Which one do we have the least? That's going to be 18.

[00:00:52]So, our least common denominator is going to be 18.

[00:00:56]Now, let's look at our fractions again.

[00:00:58]Let's look at our denominator of 4/9.

[00:01:00]What do we got to multiply 9 by to get 18? That's going to be 2. Whatever you multiply your denominator by, you also have to multiply your numerator by to keep that fraction equivalent. Let's do the same thing to 7/6. What do you got to multiply your denominator by to get 18? Three.

[00:01:17]Whatever you multiply your denominator by, you also multiply your numerator by to keep equivalent fractions. Now, let's rewrite our fractions and add them.

[00:01:26]We got 2 * 4, that's 8. 2 * 9, that's 18.

[00:01:30]Plus 7 * 3, that's 21.

[00:01:34]6 * 3 is 18. Now that we got common denominators, we can go ahead and add our fractions by keeping our denominators the same and just adding the numerator, the top numbers.

[00:01:45]Let's keep our denominator the same, 18, and let's add our numerator. 8 + 21 is 29. And there you have it. That's how you add fractions with unlike denominators. Hit that like button, subscribe, and I see you guys next video.