To compare two fractions, you must find the GCF. As an example, if you were comparing 1/2 and 2, it can be turned into a fraction because 2 is the same as 2/1. Hope this answers your question. Let me know if you need more help.
They compare because the numerator is like part of a whole the denominator is the whole the dividend is the whole number and the divisor is the partial
