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What is the LCD of 2 4 5?

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The LCD, or Lowest Common Denominator, is the smallest multiple of each of the denominators of a set of fractions. So, assuming that 2, 4 and 5 are denominators of fractions (1/2, 1/4 and 1/5, for example), the LCD would be 20, because 20 is the lowest number that 2, 4 and 5 multiply into. So, your new fractions would be 10/20, 5/20 and 4/20. The purpose of finding the LCD is to allow for multiplying fractions together, or simply comparing them easily.
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What is the LCD of 4 5 7?

The lowest common dominator is the least common  multiple of the set of fractions. It is used to simplify adding,  subtracting and comparing fractions.   4: 4, 8, 12, 16

What is the LCD of 3 4 and 5?

The least common denominator is the least common  multiple of the denominators. The least common multiple is the  smallest number that is multiple of two or more numbers. 

What is the LCM of 2 4 5?

The least common multiple is the smallest number that is multiple  of two or more numbers.   The LCM of 2, 4, and 5 is 20.

What is the lcd of 4 and 2 and 6?

I am assuming that 4, 2, and 6 are the denominators of some fractions. That being said. LCD means Least Common Multiple of the Denominators. So you need to find the Least Co