一根绳子长25米，剪10米做一根长跳绳，剩下的每2米做一根短跳绳，可以做多少根短跳绳？还剩下多少米？
你能全算对吗？试试看÷=×3=﹣= 6÷=（+）×56=+=×= 1÷5×=
一堆沙石，用去35吨，还剩15吨，剩下的沙石占这堆沙石的几分之几？
口算下面各题．= 18÷===．
直接写出得数．= 3﹣== 0.12÷20%= 0×= 0.56×0.1=÷26== 15﹣﹣=×4÷×4=
直接写出得数+=÷=÷=+×=×= 12×=×= 21÷﹣84= 12××=÷=÷4=+÷2=
÷
=
×3=
﹣
= 6÷
=（
+
）×56=
+
=
×
= 1÷5×
=
= 18÷
=
=
=
．
= 3﹣
=
= 0.12÷20%= 0×
=
÷26=
= 15﹣
﹣
=
×4÷
+
=
÷
=
÷
=
+
×
=
×
= 12×
=
×
= 21÷
﹣84=
×
=
÷
=
÷4=
+
÷2=
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