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There is none because the Least Common Denominator (or LCD) is the Least Common Multiple (LCM) of the denominators of a pair of fractions.

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Q: What are the least common denominators of 20?

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The least common denominator is the least common multiple of the denominators.

The least common multiple of the denominators is knows as the LCD or least common denominator.

There is none because the Least Common Denominator (or LCD) is the Least Common Multiple (LCM) of the denominators of a pair of fractions.

The least common denominator is the least common multiple of the denominators of the fractions.

If the GCF of the denominators is 1, the least common denominator is their product.

The least common denominator of two fractions is the least common multiple of the two denominators.

the least common denominator

You need at least two denominators to find an LCD. If that's 4 and 5, the LCD is 20.

Yes.

I am guessing you mean the least common denominator, which is the LCM of the denominators 4 and 20. The answer is 20.

The Least (or Lowest) Common Multiple (LCM) is the smallest number that is a multiple of both numbers. For example: the LCM of 10 and 4 is 20, because both 10 and 4 go into 20 and 20 is the smallest number both 10 and 4 can go into. To be able to add or subtract fractions they must have the same denominator. If the denominators are different then the fractions must first be converted into equivalent fractions with a common denominator; any common denominator can be used, but by using the Least Common Multiple of the denominators as the new denominator it keeps the numbers smaller; this smallest denominator is known as the Least Common Denominator Thus the Least Common Denominator is the Least Common Multiple of the denominators of two (or more) fractions (used when adding or subtracting fractions with different denominators). As the Least Common Multiple is used most often with adding or subtracting fractions, it is often referred to as the Least Common Denominator (because the numbers being considered are usually denominators of fractions).

This is called the least common denominator.

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