(115+85)*9=200*9=1800 (640+60)*7 =700*7=4900 (670+30)*6=700*6=4200
(500+45):5=500:5+45:5=109 (184+116):3 =300:3=100 (720+80):8=800:8=100
(115+85)*9=1800 (640+60)*7 =4900 (670+30)*6=4200
(500+45):5 =109 (184+116):3=100 (720+80):8=100
