四年级数学下册课件 街心广场 6（北师大版）
文档属性
| 名称 | 四年级数学下册课件 街心广场 6（北师大版） |  | |
| 格式 | rar | ||
| 文件大小 | 513.6KB | ||
| 资源类型 | 教案 | ||
| 版本资源 | 北师大版 | ||
| 科目 | 数学 | ||
| 更新时间 | 2010-03-29 19:40:00 | ||
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课件15张PPT。街心广场Decimal multiplication北师大版四年级数学下册教学目标本节课我们主要来探索乘数的变化会引起积有什么样的变化？同学们要认真观察看看乘数的小数位数和积的小数位数有什么关系，并且运用这种关系解决实际问题。review27×34=72×126=竖式计算 upright pattern 0.34×2=
0.1×10=
2.4×5=6.3×3=
3.41×10=
2.1×100=4.2×3=
0.01×1000=
5.1×2=oral calculation0.6811218.934.121012.61010.230 米2 0米 3米 2米 0.3米 0.2米 What information do you know from the picture?The length is meters The width is meters 60060.06What’s the area?30 × 20 = 600 (square meters ) 3 × 2 = 6 (square meters )0.3 × 0.2 = 0.06 (square meters )÷10÷10÷100 121.20.12260.260.026112202213两个因数一共有几位小数,积就是几位小数。The product has the same
decimals as the two factors.0.120.260.0268.6486.486.40.8645×3=
0.5×3=
5×0.3=
0.5×0.3=14×2=
0.14×2=
1.4×0.2=
0.14×0.2=3216512321.63.21.60.321.63.20.16请在下面各题中点上小数点。想一想 算一算。20×40=
0.2×0.4=
2×4=
0.02×0.04=
0.1×10=
2.4×5=6.3×3=
3.41×10=
2.1×100=4.2×3=
0.01×1000=
5.1×2=oral calculation0.6811218.934.121012.61010.230 米2 0米 3米 2米 0.3米 0.2米 What information do you know from the picture?The length is meters The width is meters 60060.06What’s the area?30 × 20 = 600 (square meters ) 3 × 2 = 6 (square meters )0.3 × 0.2 = 0.06 (square meters )÷10÷10÷100 121.20.12260.260.026112202213两个因数一共有几位小数,积就是几位小数。The product has the same
decimals as the two factors.0.120.260.0268.6486.486.40.8645×3=
0.5×3=
5×0.3=
0.5×0.3=14×2=
0.14×2=
1.4×0.2=
0.14×0.2=3216512321.63.21.60.321.63.20.16请在下面各题中点上小数点。想一想 算一算。20×40=
0.2×0.4=
2×4=
0.02×0.04=