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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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Why is 2 plus 2 4 not 5?

The reasoning all relates to Einsteins theory of relativity. Whenan apple falls on your head and your like "Where did this comefrom?" well the answer to this question is that

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 LCD of 5 and 6?

5 factors into 1 and 5 6 factors into 2 and 3 Therefore, the least common multiple is 1*2*3*5 = 30 This is what you would use for the LCD, convert the fifths and sixths

What is the LCD of 5 and 10?

Write the multiples of each: 5, 10, 15, 20 10, 20, 30, 40 10 is in each, so it is the answer.

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