28×12= 14×4= 56×8= 56×2=
①142×36
②506×25
③390×20
④175×48
⑤480÷20
⑥143÷22
⑦495÷62
⑧63÷21
12﹣3.6= 12×0.5= 36×25%= ×6+=
+= ÷4= 0××5= 28÷1.25÷8=
①634﹣3.2×1.5÷0.1
②9.43+0.78﹣3.43
③
④
⑤
⑥