一年级数学下册第1章逛公园—20以内的退位减法1.2十几减8、7课件青岛版六三制.ppt

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一共有15只船, 划走了8只。,有16瓶矿泉水。,我们买7瓶。,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?,15可以分成10和5。,10,8,2,2,5,7,7,还剩几只船?,8可以分成5和3。,15,5,10,10,3,7,7,8+7=15 15-8=7,7,归纳总结:,十几减8的计算方法和十几减9的计算方法相同,可以用破十法、平十法、想加法算减法。,9,还剩几瓶矿泉水?,157=8,158=7,159=6,比一比,想一想他们之间有什么联系?,1.,84= 86= 74= 77= 128= 148= 117= 147=,12,4,14,6,11,4,14,7,2.,12,7,5,17,8,9,3.,8,7,15,8,7,15,8,7,15,7,9,16,7,9,16,7,9,16,这节课我学会了什么?快来说一说吧!,作业,请完成教材第78页自主练习第三题、第四题、第六题。,xx小学 x年级x班,xxx,

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