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 is 70 the numerators would become 63 and 30
The lowest common denominator of any set of whole numbers is 1
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.