五下异分母分数加法和减法.ppt

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,异分母分数加法和减法,五接桥小学 徐 祥,苏教版五年级数学下册,同分母分数加、减法,异分母分数加、减法,Yifenmu,fenshu,jiafa,he,jianfa,异分母分数加法和减法,=,=,Yifenmu,fenshu,jiafa,he,jianfa,异分母分数加法和减法,Yifenmu,fenshu,jiafa,he,jianfa,异分母分数加法和减法,Yifenmu,fenshu,jiafa,he,jianfa,异分母分数加法和减法,Yifenmu,fenshu,jiafa,he,jianfa,异分母分数加法和减法,=,=,=,0.5+0.25,=0.75,Yifenmu,fenshu,jiafa,he,jianfa,异分母分数加法和减法,=,=,计算异分母分数加法，通常先通分，把异分母分数化成同分母分数，再相加。,Yifenmu,fenshu,jiafa,he,jianfa,异分母分数加法和减法,=,=,=,计算异分母分数减法，通常先通分化成同分母分数后再减。计算结果能约分的要约成最简分数。,试一试,Yifenmu,fenshu,jiafa,he,jianfa,异分母分数加法和减法,试一试,1,=,=,验算：,=,=,1,Yifenmu,fenshu,jiafa,he,jianfa,异分母分数加法和减法,练一练,计算下面各题，并验算。,Yifenmu,fenshu,jiafa,he,jianfa,异分母分数加法和减法,计算异分母分数加、减法时，先通分，再按照同分母分数加、减法进行计算；计算结果能约分的要约成最简分数；计算后要自觉进行检验。,Yifenmu,fenshu,jiafa,he,jianfa,异分母分数加法和减法,解决问题,=,=,Yifenmu,fenshu,jiafa,he,jianfa,异分母分数加法和减法,解决问题,=,（千米）,=,（千米）,=,（千米）,Yifenmu,fenshu,jiafa,he,jianfa,异分母分数加法和减法,总结反思,通过这节课的学习，你能把计算异分母分数加、减法的经验和体会与大家分享吗？,Yifenmu,fenshu,jiafa,he,jianfa,异分母分数加法和减法,