173×5= 305×7= 3×590=
57+36= 123×2= 650+260= 4500-2500=
198×0= 80×5= 104×5≈ 497×6≈
+= -= += 1-=
41+38=
90﹣26=
24×2=
200×6=
80×5=
160+230=
0×78=
470﹣250=
=
2+3×30=
29×7≈
603+298≈
719﹣204≈
399×2≈