青岛三年级数学上册.pptx

第1页/共23页胎儿时期头长占整个身长的()?21婴儿时期头长占整个身长的()?41第2页/共23页83()()85()()上身的长约占整个身长83()()第3页/共23页 里面有3个 。里面有5个 。第4页/共23页83()()84()()成人的躯干和下肢共占身长的几分之几？怎样列算式？你能提出什么问题？第5页/共23页 是（）个 ，是（）个34 3个 与 4 个 合起来是（）个 就是（）。7 +你会计算吗？第6页/共23页 +=分子相加 分母不变同分母分数相加怎样计算？同分母分数 相 加，分母不变，把分子相加。第7页/共23页 -口述计算过程 是（）个 ，是（）个4314个 减去3个 就是（）个 ，就是第8页/共23页 -=分子相减 分母不变同分母分数相减怎样计算？同分母分数 相 减，分母不变，把分子相减。第9页/共23页怎样计算同分母分数加减法？同分母分数 相 加 减，分母不变，把分子相加减。第10页/共23页 +=-=第11页/共23页我涂了()()62我涂了64()()一共涂了 ,()()66也就是（）1（）+（）=（）=（）1第12页/共23页 1还可以写成 ()()？第13页/共23页第14页/共23页 +=-=+=1 1-=第15页/共23页1.判断对错。（1）同分母分数相加减，分母不变，把分子相加减。（）（2）+=。（）第16页/共23页第17页/共23页 你还能说出得数是 的算式？第18页/共23页第19页/共23页 同分母分数加减法 分母不变 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WkShPdMaJ7F4C1z)w&s!pYm第22页/共23页感谢您的观看！第23页/共23页