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Several methods are possible. First, you can just multiply two numbers to get a common denominator, and not worry whether it is the least such common denominator, or not. To actually get the LCD, use one of the following methods:

(1) Take consecutive multiples of the largest number and see which of them is divisible by the other one.

(2) Use prime factorization.

(3) Use Euclid's algorithm. This one is the most efficient method for larger numbers.

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Q: How do you find the least common denominator in an equation?
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What is the least common denominator of 9?

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


Is it always necessary to find the least common denominator to compare the sizes of fractions?

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


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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.


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To find the least common denominator of a set of unlike fractions, you first need to list the prime factors of each denominator. Then, identify the highest power of each prime factor that appears in any of the denominators. Finally, multiply these highest powers together to find the least common multiple, which will be the least common denominator for the fractions.


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


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