ccalgebrasucks: how to subtract and add fractions 8/11 - 4/15
Multiply the numerator and denominator of one of the fractions by the denominator of the other. In this example :
8 (numerator) * 15 (denominator of other fraction) / 11 (denominator) * 15 (denominator of other fraction) -> (8*15)/(11*15) -> 120/165
120/165 - (4*11)/(15*11) -> 120/165 - 44/165 -> (120-44)/165 ->
76/165
