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The lowest common denominator of 30 and 42 is 210.
30=2x3x5 45=3x3x5 2x3x3x5=90 The lowest common multiple.
If you mean the lowest, it's 2
The common denominator is 30. There are others, but 30 is the LCD.
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.