The LCD of 18 and 30 is 90
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The Least Common Multiple of 12, 18, and 30 is 180.
The least common denominator of 5 and 6 is 30.
The Least Common Multiple (LCM) of (18,30,42) is 630.
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
The GCF is 6.The LCM is 360.6 and 360 respectively.