(3/8+4 1/3)*240=(3/8+13/3)*240=(9/24+104/24)*240= 113/24*240=113*10=1130
(5 1/2+2 1/8)*40=(11/2+17/8)*40=(44/8+17/8)*40= 61/8*40=61*5=305
(6 2/3-4 3/4)*3 21/25=(20/3-19/4)*96/25= (80/12-57/12)*96/25=23/12*96/25=23/1*8/25=184/25= 7 9/25
(4 5/9-1/6)*2 4/25=(36/9-1/6)*54/25=(72/18-3/18)*54/25 =69/18*54/25=69/1*3/25=207/25=8 7/25