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包装这个礼品盒用纸 0.8 米 , 用彩带 2.4 米

包装这个礼品盒用纸 0.8 米 , 用彩带 2.4 米. 包装纸 : 每米 2.6 元 彩带 : 每米 0.85 元. （ 1 ）买包装纸需要多少钱？. （ 2 ）买彩带需要多少钱？ （ 3 ）一共需要花多少钱？. 方法： 在计算小数乘法时，先按整数乘法计算，然后再看两个乘数一共有几位小数，就在积中从右往左数出几位，点上小数点就可以了。. 练习：. 请你给下列得数点上小数点，使计算正确 2.63×1.1=2893 7.5×0.27=2025 0.73×0.99=7227 6.4×0.52=3328 3.14×1.5=4710. 小测.

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包装这个礼品盒用纸 0.8 米 , 用彩带 2.4 米

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  1. 包装这个礼品盒用纸0.8米,用彩带2.4米 包装纸: 每米2.6元 彩带:每米0.85元

  2. （1）买包装纸需要多少钱？ • （2）买彩带需要多少钱？ • （3）一共需要花多少钱？

  3. 方法： • 在计算小数乘法时，先按整数乘法计算，然后再看两个乘数一共有几位小数，就在积中从右往左数出几位，点上小数点就可以了。

  4. 练习： • 请你给下列得数点上小数点，使计算正确 • 2.63×1.1=2893 • 7.5×0.27=2025 • 0.73×0.99=7227 • 6.4×0.52=3328 • 3.14×1.5=4710

  5. 小测 • 用竖式计算： • 4.8×1.2= 9.32×1.4= • 0.32×1.2= 0.15×0.63=

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