In actual problems, we convert two (or more) fractions so that they have equal denominators.
fractions
Two fractions that are the same are called equivalent fractions. Example: 4/5 and 8/10. When two fractions are set equal to each other in an equation, that equation is called a proportion: 4/5 = x/10
the difference between two equal fractions is zero.
It could be called an equivalence relationship.
Those would be "equivalent" fractions.
If two fractions are equal then the difference between them is zero (0).
If the denominators (bottom numbers) are not equal, making equivalent fractions of them so that the denominators are equal. With the denominators equal if the numerators (top numbers) are equal, then the fractions are equal.
Two fractions set equal to each other form a proportion.
a/b = c/d is one possible form.
Common denominator
Equivalent fractions
complex fractions can be multiplied when you have two fractions multiplied and equal a whole number.