一年级数学下册第5章绿色行动—100以内数的加减法(一)5.4两位数减一位数退位减法课件青岛版六三制.ppt

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1、从图中,你知道了哪些数学信息?根据这些信息,你能提出什么数学问题?,一年级展出9幅画。二年级展出30幅画。三年级展出38幅画。二年级比一年级多展出多少幅画?,二年级来了8人。三年级来了24人。二年级比三年级少来了多少人?,10 - 9 = 1,20 + 1 = 21,21,二年级比一年级多展出多少幅画?,20 + 1 = 21,30 - 10 = 20,二年级比一年级多展出多少幅画?,21,14 - 8 = 6,10 + 6 = 16,16,二年级比三年级少来多少人?,10 - 8 = 2,14 + 2 = 16,二年级比三年级少来多少人?,16,24 - 10 = 14,14 + 2 = 1

2、6,二年级比三年级少来多少人?,16,8-9= 9,4-7= 7,6-8= 8,7-9= 8,4-8= 6,0-6= 4,0-5= 5,0-7= 3,0-6= 4,0-9= 1,3 2,2 1,6 5,4 3,6 54,2 1,4 3,2 1,3 2,5 4,想一想:为什么十位会少1呢?,30-9=21,3捆,2捆,24-8=16,2捆,1捆,1.哪片叶子生病了?,48-6=,52-9=,3,2,4,5,3,4,想一想:个位够减和不够减,在计算时有什么区别呢?,(3)你还能解决哪些问题?,(1) 经过玉米地去 家一共要走多少米?,(2) 家到萝卜地比 家到萝卜地远多少米?,33,60,91,+,52,9,43,-,2.解决实际问题 。,这节课你有哪 些收获?,作业,请完成教材第54页“自主练习”第5、7题。,xx小学 x年级x班,xxx,

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