Cross Multiplication can be used to determine if two fractions are equal. If the numerator multiplied by the other fraction's denominator and the same with the left over numerator and denominator then you can compare them. Then you find the biggest common factor. When working with variables, solve the variable and then plug it back it and find the GCF.

Cross Multiplication can be used to determine if two fractions are equal. If the numerator multiplied by the other fraction's denominator and the same with the left over numerator and denominator then you can compare them. Then you find the biggest common factor. When working with variables, solve the variable and then plug it back it and find the GCF.