This method works pretty good. But, adding fractions with larger numbers in the denominators it can get pretty messy. Again, see the Related Link for another way to find a least common denominator.
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When adding or subtracting fractions with different denominators, the first step is to find a common denominator. This involves finding the least common multiple (LCM) of the two denominators. Once you have a common denominator, you can then add or subtract the numerators of the fractions accordingly.
The lowest common denominator of any set of whole numbers is 1
the lowest common denominator is 70 the numerators would become 63 and 30
The lowest common denominator of any set of whole numbers is 1
Not lowest common, nor even denominator. You have to have at least two numbers to have a common denominator, just a factor, which 61 only has two; 1 and 61. 61's a prime number.