1
130
It is 130
You look for common factors in the numerator and the denominator, then divide both the numerator and the denominator by that common factor.
It is 100
The GCF is 5. The LCM is 106600. The greatest common denominator is infinite.
84/100 is one fraction. To find a common denominator, you need at least one more.
Any multiple of 100
8100
There are infinitely many common denominators and so it makes no sense to ask about the common denominator. For example, 45000 is a common denominator.
Expressed as a proper fraction in its simplest form, by dividing the numerator and denominator by 10, 100/130 is equal to 10/13 or ten thirteenths.
7 and 100 only have the common factor of 1, so the LCM or LCD (least common denominator) for fractions having 7 & 100 for denominators is 7*100 = 700.
LCD(100, 1) = 100.