Fraction Arithmetic

To add two fractions of the form

num1
den1
+
num2
den2
We use the formula
num1
den1
+
num2
den2
=
num1*den2 + num2*den1
den1*den2
To multiply two fractions (also known as taking the product of two fractions), the resulting numerator is the product of the two initial numerators, and likewise the resulting denominator is the product of the two initial denominators.
num1
den1
*
num2
den2
=
num1*num2
den1*den2

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