一年级数学下册第6章100以内的加法和减法(一)6.3.2两位数减一位数(退位)课件新人教版.ppt

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574,5740,753,7530,695,6950,53,17,72,45,64,19,口算。,这两组题计算时有 什么相同的地方?,还剩多少个足球?,这道题怎样计算?,怎样解答呢?,368,试一试吧,把你的想法写在练习本上。,368,26,10,2,28,368,20,16,8,28,6减8不够减怎么办?,还有其他算法吗?,368366230228,平十法:,归纳总结:,两位数减一位数(退位)的计算方法: 两位数减一位数,从个位减起,如果个位不够减,就从十位退一当十,与个位上的数合在一起减一位数,同时十位上的数减去 1。,27,35,1.先圈一圈,再计算。,这节课我学会了什么?快来说一说吧!,作业,请完成教材第72页练习十六 第八题、第九题。,xx小学 x年级x班,xxx,

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