直接写出得数．
400×5= 0×39= 32÷4= 
= 405×2≈
72÷8= 12×3= 420+170= 
= 89×7≈
90﹣43= 80÷9= 3000×2= 1﹣
= 392×5≈
68÷7= 21×5= 61﹣16= 
= 58×6≈
直接写出得数．
400×5= 0×39= 32÷4= = 405×2≈
72÷8= 12×3= 420+170= = 89×7≈
90﹣43= 80÷9= 3000×2= 1﹣= 392×5≈
68÷7= 21×5= 61﹣16= = 58×6≈
×60
．
．并说一说每种图形的
×
=
×
=
=
=
﹣
﹣
=
﹣
=
×30=
×
=
×
=
×33=
×22= 16×
=
粤公网安备 44130202000953号