10
5
It is 10 so that 2/5 + 1/2 becomes 4/10 + 5/10 = 9/10
60.
45
A common denominator, though not the least, is 80.
10
60 is the least common denominator of 3 4 5 6 10 and 15.
There is none because the Least Common Denominator (or LCD) is the Least Common Multiple (LCM) of the denominators of a pair of fractions.
100
5
LCD(10, 11, 5) = 110.
If that's 5/6 and 10/50, the least common denominator is 150. But since 10/50 = 1/5, the least common denominator is 30.
The least common denominator is 60.
Least common denominator of 7 and 5 is 35.
The LCD is 10.
The Least Common Denominator of 5, 7, and 35 is 1.