Cálculo mental

85 + 50 x 90 : 10 = ____________________

720 : 80 x ( 120 - 80 ) = ____________________

89 + 44 : 4 + ( 50 - 10 ) x 9 = ____________________

500 - 240 : 6 + 8 = ____________________

120 : 20 x ( 9 + 31 ) = ____________________