The LCD of 2/7 and 4/5 is 35.
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The least common denominator of 9 tenths and one forty fifths is 10.
The least common denominator is 60.
a least common (LCD) denominator is a least common multiple (LCM); only it's a fraction and it's LCM is in the denominator's place.
The least common denominator for 9 and 10 is 90.
The least common denominator of 13 and 52 is52