# Arithmetic : Fractions

When fractions have the same (like) denominator, add or subtract the numerators and place the result over the common denominator. Then simplify the new fraction if required.
Thus, Steve consumed 3
When fractions do not have the same denominator, addition and subtraction are performed after each fraction is expressed as an equivalent fraction with the (least) common denominator given by the LCM of the denominators. Using the least common multiple (LCM) typically reduces the computational effort.
GMAT Math Review - Arithmetic : Practice Exercise for Fractions |

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