Unit 2 Review 5.NF.1 and 5.NF.2

Find a common denominators by looking at what multiples your two current denominators have in common.

What you do to the bottom, you gotta do to the top (ie- if you multiply the denominator by 3 to get to your new denominator, you have to do the same thing to your numerator)

Once you have a common denominator and your NEW numerators, add or subtract your numerators, keeping your denominators the same.

Make sure your answer is simplified by checking that there are no common factors between your numerator and denominator. If there are, simply divide top and bottom by that factor. ( ie-