120÷30 = 640÷80 = 360÷90 = 720÷80 =
320÷80 = 180÷30 = 100÷20 = 220÷20 =
850×4= 36+268=
607×6= ★703-219=
86×5+100 183-(183-175) 360+540÷9
67+28= 960﹣540= 1.6×5= 7.5+2.7=
= = 53÷100= =