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 commonmultiple of the set of fractions. It is used to simplify adding,subtracting and comparing fractions. 4: 4, 8, 12, 16, 20, 24