五年级上册数学习题课件-第1单元：4.整数乘法运算定律推广到小数-人教新课标 (共14张PPT).pptx

1、件练习习课人教版-五年级-上第1单元4整数乘法运算定律推广到小数1.10.9=2.40.3=12.20.1=1250.008=0.70.3=12.50.2=0.130.3=0.60.4=0.990.990.720.721.221.221 10.210.212.52.50.0390.0390.240.24知识点2:小数连乘、乘加、乘减的简便运算1.简便运算。5.063.3+6.75.06=(3.3+6.7)=(3.3+6.7)5.065.06=10=105.065.06=50.6=50.62.根据乘法运算定律填空。(1)1.32.1=()()(2)12.5(0.340.8)=()()()(3)2

2、.45.8+7.65.8=(+)()2.12.11.31.312.512.50.80.80.340.342.42.47.67.65.85.83.用简便方法计算下面各题。(1)4.859.9+0.485(2)2.5460.4(3)38.499(4)4.653.8-3.653.8=4.85=4.859.9+4.859.9+4.850.10.1=4.85=4.85(9.9+0.1)(9.9+0.1)=48.5=48.5=2.5=2.50.40.44646=1=14646=46=46=38.4=38.4(100-1)(100-1)=3801.6=3801.6=(4.65-3.65)=(4.65-3.6

3、5)3.83.8=3.8=3.84.在计算正确的同学后面的()里画“”。(1)简算:0.251.250.48李丽()0.251.250.48=(0.250.4)+(1.258)=0.1+10=10.1刘会()0.251.250.48=(0.250.4)(1.258)=0.110=1(2)简算:3.1102李丽()3.1102=3.1100+3.12=310+6.2=316.2刘会()3.1102=3.1100+2=310+2=3125.王阿姨去买水果。苹果每千克5.4元,香蕉每千克4.6元。她两种水果各买2.5千克,王阿姨一共花了多少钱?5.45.42.5+4.62.5+4.62.52.5=(

4、5.4+4.6)=(5.4+4.6)2.52.5=25(=25(元元)答：答：一共花了一共花了2525元。元。6.希希要买12支铅笔,12支圆珠笔。铅笔0.8元/支,圆珠笔1.2元/支。他带25元钱,够吗?(0.8+1.2)(0.8+1.2)12=24(12=24(元元)24252425答：答：所以带所以带2525元钱够。元钱够。7.超市一天卖出饮料4箱,共收入多少元?2.52.524244=2.54=2.54 424=240(24=240(元元)答：答：共收入共收入240240元元。8.计算2004.051997.05-2001.051999.05。原式原式=2004.05=2004.051999.05-2004.051999.05-2004.052-2-2001.052001.051999.051999.05=(2004.05-2001.05)=(2004.05-2001.05)1999.05-2004.051999.05-2004.052 2=3=32000-32000-30.95-4008.10.95-4008.1=6000-2.85-4008.1=6000-2.85-4008.1=1989.05=1989.05看谢谢观