70
It is: 420
The least common denominator would be 50
least common denominator for 15 and 10 is 30, so 9/15 = 18/30 and 7/10 = 21/30
40
It is: 630
Least common denominator of 7 and 5 is 35.
The Least Common Denominator of 5, 7, and 35 is 1.
The least common denominator (LCD) refers to a multiple that is COMMON to two or more numbers. You have only one number in the question! The least denominator for a number is itself.
7
40
It is: 50
The least common denominator for 10, 8, and 7 is one. Since each whole number can be written as itself over one, these numbers already have the same denominator, which in turn is the LCD.