(1)90 - 4 = (2)70 - 5 = (3)90 - 2 = (4)10 - 9 = (5)20 - 5 = (6)40 - 8 = (7)90 - 4 = (8)90 - 9 = (9)10 - 5 = (10)10 - 5 = (11)50 - 3 = (12)50 - 2 = (13)70 - 1 = (14)90 - 6 = (15)20 - 1 =
