人教版五年级下册数学(练习十九教学课件.ppt

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1、练习十九人教新课标五年级数学下册Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.()()=()()()=()()()=()0.33100.250.4251004101、分别用小数和分数表示下面每个图中的涂色部分。Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.(1)0.8

2、里面有8个()分之一，表示()分之()，化成分数是。(2)0.05里面有5个()分之一,化成分数是。(3)0.007里面有7个()分之一,化成分数是。(4)0.36里面有36个()分之一,化成分数是。()()()()71000()()5100()()2、填空十十八810百千百36100Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET

3、3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.4.把下面的分数化成小数。（不能化成有限小数的，保留三位小数。）=0.31=0.08≈0.233≈0.444≈0.833=0.22=1.15Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.0.1253100.6250.5145.在里填上适当的小数或分数。010.250.30.8181258340.7545Evalu

4、ationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.用小数表示用分数表示40cm150g125cm23680dm3mmkgkgdm2dm2m3m30.40.151.253.686、在下表的空格里填上适当的数，使每行的3个数量都相等。Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.7.李

5、阿姨和王叔叔谁打字快些?我平均每秒打0.9个字。我1分钟打了50个字，平均每秒打了个字。560.83＜0.9答:李阿姨打字快。56≈0.83Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.8.答:离学校远的是小林家。51225÷60=14=312如果他们两人的行走速度相同，谁家离学校远些?小林小凡我从学校回家要花25分钟。我回家要花小时。14Evaluationonly.CreatedwithAspose.Slidesfo

6、r.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.常用分数与小数的互化：1214120184535251534125=0.5=0.25=0.75=0.05=0.2=0.6=0.8=0.125=0.4=0.0438=0.37578=0.875Evaluationonly.CreatedwithAspose.S

7、lidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.谢谢Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.