30=2x3x5
45=3x3x5
2x3x3x5=90
The lowest common multiple.
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The common denominator is 30. There are others, but 30 is the LCD.
The greatest common denominator is infinite. The least common denominator is 45.
The common denominator of 15 and 9 is 45.
It is 45*31 = 1395.
The lowest common denominator of 30 and 42 is 210.