Question

PLEASE HELP!!!!! Which of the following numbers could be used as a common denominator for adding the fractions 2/63 , -4/35, and 8/2. ?

105
63
315
7

Answer 1

The number wich is divisible by the three denominators.

Answer 2

What do you mean

Answer 3

the last one is 8/21

Answer 4

Divisible means that if you divide one number by another, you´ll get an exact quotient
For example , all even numbers are divisible by 2.

So in this case, you can verify that
315/63=5
315/35=9
315/21=15

So 315 is divisible by 63,35,21, therefore can be used as common denominator to add that fractions.

315 is also called the least common multiple of 63,35,21..

Answer 5

thanks