口算20%×50= 7÷1.4= =（+）×4= 0.77+0.33= 44÷=81÷= （0.18+0.9）÷9=
========
口算显身手！=========
计算下面各题． 40××60 8× 27×．
用颜色涂出每种图形的．并说一说每种图形的的个数一样多吗？为什么？
请观察并计算下列各题，你发现了什么？×=×===﹣=﹣=﹣=﹣=
=
+
）×4= 0.77+0.33= 44÷
=
= （0.18+0.9）÷9=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
×60
．
．并说一说每种图形的
×
=
×
=
=
=
﹣
﹣
=
﹣
=
粤公网安备 44130202000953号