Video (2 min.) -   http://screencast.com/t/iLFtLd5KI8

 

To add fractions the bottom numbers (denominators) must match first, then just add the top numbers.

To multiply fractions they do not need to match and you multiply both tops and bottoms straight across.

 

 http://www.math-drills.com/fractions/fractions_add_like_denominator_no_reduction_001.pdf