Step-by-step explanation: The fractions have unlike denominators. First, find the Least Common Denominator and rewrite the fractions with the common denominator.
LCD(, ) = 100
Multiply both the numerator and denominator of each fraction by the number that makes its denominator equal the LCD. This is basically multiplying each fraction by 1.
(×)+(×)=?
Complete the multiplication and the equation becomes
+=?
The two fractions now have like denominators so you can add the numerators.
Then:
=
This fraction can be reduced by dividing both the numerator and denominator by the Greatest Common Factor of 80 and 100 using