SIMPLIFY 4/5 MULTIPLED BY 1/4 + 5/6

1 / 4 = 3 / 12

5 / 6 = 10 / 12

( 4 / 5 ) ∙ ( 1 / 4 + 5 / 6 ) = ( 4 / 5 ) ∙ ( 3 / 12 + 10 / 12 ) =

( 4 / 5 ) ∙ ( 13 / 12 ) = 4 ∙ 13 / 5 ∙ 12 =

4 ∙ 13 / 5 ∙ 4 ∙ 3 = 13 / 5 ∙ 3 = 13 / 15