• Adding and subtracting fractions with the same denominator
  You can add and subtract like fractions easily - simply add or subtract the numerators and write the sum over the common denominator.
  
  
• Adding and subtracting fractions with different denominator
  Before you can add or subtract fractions with different denominators, you must first find equivalent fractions with the same denominator, like this:
  1. Find the smallest multiple (LCM) of both numbers.
  2. Rewrite the fractions as equivalent fractions with the LCM as the denominator.