To be able to divide by 15, the lowest common denominator of 414 and 15 should end itself by 5 or zero. This number would be 414 x 5 = 2070. Check: 2070 : 15 = 138.
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The denominators of 20 and 15 are both 1, therefore, the lowest common denominator is 1.
945 is the lowest common denominator. 3 is the greatest common factor.
the answer is 108
The word "lowest" is a superlative. Being a superlative means that there can be only one such number so asking about lowest common denominators is nonsense. The lowest common denominator is 102172070.
There is an infinite number of common denominators for these two fractions. The lowest common denominator is 45.