Fractions were used first by the Greeks & Egyptians. Fractions represent a part of a whole and describe how much of something that you have. We use Pizza, Pie or Cake to demonstrate to students in a picture what fractions represent. Fractions are made up of the Numerator above the line and Denominator below the line.
Reducing Fractions
http://www.math-drills.com/fractions/simplify_fractions_easy_001.php
Converting Fractions To Decimals
http://www.math-drills.com/fractions/fractions_convert_to_decimal_001.php
Adding Fractions – Common Denominators
http://www.math-drills.com/fractions/fractions_add_like_denominator_001.php
Adding Fractions – Uncommon Denominators
http://www.math-drills.com/fractions/fractions_add_easy_001.php