How do you do a fraction sum?
You multiply each fraction by the others denominator to produce 2 fractions with an equivilent denominator. You can then just add the 2 numerators over the same denominator.
\(\frac{A}{B}+\frac{C}{D}=\frac{AD}{BD}+\frac{CB}{BD}=\frac{AD+BC}{BD}\)
