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

Updated: 9/16/2023

Wiki User

14y ago

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.

Wiki User

14y ago

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