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Least common denominators or LCDs are very important when adding fractions.

For example, if we want to add 1/2 and 1/3 we need to make them look the same. That is to say we can only add like things. So we find the LCD which is 6 in this case. 1/2 is 3/6 and 1/3 is 2/6. Now we can add these and we have 5/6.

Without the LCD we could not add these or many other fractions.

We extend this idea when we add rational expressions.

Q: When do you need to find the Least common denominator in a problem?

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When comparing fractions you must find a common denominator; by finding the least common denominator it will keep the numbers (numerators and denominator) smaller .

The least common denominator is 144.

least common denominator is nothing but least common multiple of denominators.

The least common denominator of 9, 12, and 16 is 144.

Find the least common denominator.

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You need at least two numbers to find a common denominator.

When comparing fractions you must find a common denominator; by finding the least common denominator it will keep the numbers (numerators and denominator) smaller .

The least common denominator is 144.

Pick two of the fractions and find the Least Common Multiple of those two denominators. Then take that number, and find the Least Common Multiple between that and the third denominator. This number will be the Least Common Denominator between the three fractions.If you don't care to find the Least common denominator, then just take the three denominators, and multiply them together.

least common denominator is nothing but least common multiple of denominators.

That's one fraction. You need at least two to find something in common between them.

The way that you can find the least common denominator is by first multiplying the 2 bottom numbers and whatever the product is that is your common denominator. to find the smallest one, you have to keep dividing it till it is in counting order or there is an odd number.

The least common denominator of 9, 12, and 16 is 144.

You need at least two numbers to find something in common.

You need at least two numbers to find something in common.

You need at least two denominators to find something in common between them.

You need at least two numbers to find something in common. 90 can be a common denominator of other numbers, but it can't have a common denominator all by itself.