,子页,子页,子页,子页,子页题目,内容:,子页,子页,子页,子页,子页题目,内容:,子页,子页,子页,子页,子页题目,内容:,子页,子页,子页,子页,子页题目,内容:,内容:,子页题目,子页,子页,子页,子页,主页,子页,子页题目,子页,子页,子页,主页,子页,T,H,A,N,K,Y,O,U,*,北师大版 四年级下册 第三单元 小数乘法,口 算,:,125,8,=,12,5=,2.5+2=,2角,4=,8+8+8+8+8+8=,1000,4.5,8,角,8,6=48,60,温馨提示:欢迎您下载最新北师大版四年级下册买文具PPT备份,为更好地满足您的学习和使用需求,课件在下载后可以自由编辑,请您使用Microsoft PowerPoint2007以上版本或wps2019进行调整!In order to better meet your learning and use needs,the courseware can be freely edited after downloading.Please use Microsoft PowerPoint 2007 or above or wps2019 to adjust!!,一个书包,30,元,买,4,个需,要多少,元?,30,4=120(,元),答:买,4,个需要,120,元,铅笔每支0.3元,橡皮每块0.2元,卷笔刀每个,0.7,元,尺子每把0.4元,文 具 店,买4块,要多少钱?,0.2元,0.2元,0.2元,0.2元,笑笑是这样做的,你能看懂吗?,0.24,(),0.2,0.2,0.2,0.2,0.8,借助直观模型计算,答:买,4,块橡皮需要,0.8,元。,0.24,0.8,(元),转化成整数乘法计算,0.2 4,0.2,元,=2,角,2 4=8,(角),8,角,=0.8,元,0.8,(元),答:买,4,块橡皮需要,0.8,元。,小锦囊:解决小数乘整数的实际问题,还可以利用,单位换算把小数转化成整数再相乘。,最新北师大版四年级下册买文具PPT备份,买,3,把尺子需要多少元?,0.43,(),1,2,3,0.4,元,4,角,34,12,(角),12,角,1.2,元,0.43,1.2,(元),0.4,0.4,0.4,答:买,3,把尺子需要,1.2,元。,1.2,元,涂一涂,填一填。,0.0110=(),0.1,小练习,涂一涂,填一填。,0.0150=(),0.5,涂一涂,填一填。,0.01100=(),1,想一想:0.011000=(),10,小,结,小数乘整数,与整数乘法的意义相同,就是求,几个相同加数的和,的,简便运算,。,7,10,0.7,1,0,7,70,4,6,0.4,6,3,2,0.3,2,来挑战吧!,6,0.6,24,2.4,3,0.12,0.242,0.43,2,.,2,3,1个日记本2.5元,丁丁要买3个这样的日记本,需要多少钱呢?,拓,展,把一根木条都锯成0.4米长的小段,共锯了4次,这根木条原长多少米?,1.,买,4,把卷笔刀需要多少元?涂一涂,算一算,,与同伴交流你的想法。,2.,买,6,支铅笔需要多少元?,与同伴交流你的想法。,最新北师大版四年级下册买文具PPT备份,3.,0.3,3,0.2,8,4,0.2,3,0.5,0.4,4,0.1,9,0.7,2,6,0.2,0.6,4,0.9,1.5,1.4,1.6,1.6,1.2,0.8,0.9,2.4,4.,涂一涂,填一填。,0.1,1,0.5,5.,