竖式计算．280×70= 274×29= 307×42= 480×30=
甲数比乙数多，那么乙数就比甲数少几分之几？
一块2公顷的菜地，平均分成5份．每份是多少公项？其中3份种白菜，种白菜的面积占这块菜地的几分之几？
直接写结果． 1÷=×=÷=+×=÷=÷2=÷= 1÷7×=×=÷=÷=×÷×=
÷7=×= 6÷=+= 16×=÷=﹣=×=
直接写得数 1÷=÷10=××=×=÷= 6×=
，那么乙数就比甲数少几分之几？
=
×
=
÷
=
+
×
=
÷
÷2=
÷
= 1÷7×
=
×
=
÷
=
÷
=
×
÷
=
÷7=
×
= 6÷
=
+
=
÷
=
=
×
=
=
÷10=
×
×
=
×
=
÷
= 6×
=
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