"Common" means "same for both". There's nothing common about a single number.
You need at least two numbers before anything common to them can exist.
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1.5 = 3/2 The denominator is 2.
6 the lowest common denominator is the least common multiple of the denominators after both fractions have been simplified as far as possible. 3/6 can be simplified as 1/2. 2/3 cannot be simplified any further. The LCM of 3 and 2 is 6, so the lowest common denominator is 6.
945 is the lowest common denominator. 3 is the greatest common factor.
1/2 , 3/4 , 7/8. The denominators are 2, 4, and 8. The lowest common multiple of these numbers is 8. This becomes the lowest common denominator.
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