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Why do you have to have a common denominator?
A common denominator is needed when adding or subtracting fractions of different denominators.
How do you solve a fraction problem when you don't have the same denominator?
If you are adding or subtracting unlike fractions, convert them to equivalent fractions with a common denominator.
What is the least common denominator of two fractions?
The least common denominator is the least common multiple of the denominators of the fractions.
What is an LCD in math?
LCD means lowest common denominator which is needed when adding or subtracting fractions that have different denominators.
Why does the fraction that results from adding or subtracting fractions with unlike denominators have a different denominator?
When you add fractions that have unlike denominators, the first step is to convert them so they are expressed as fractions using the least common denominator. The result is that the answer will have a different denominator, or it may use one of the original two denominators.For example if you are adding 1/10 and 3/5, the least common denominator is 10, the problem is rewritten as 1/10 + 6/10 = 7/10But if you are adding 1/5 and 1/6, the least common denominator is 30 and the problem is rewritten as 6/30 + 5/30 = 11/30
