一年级数学下册第1单元加与减(一)《买铅笔》课件1(新版)北师大版.ppt

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买铅笔,情 境 导 入,探 究 新 知,15支铅笔,卖出9支,还剩多少支?,15,9,=,6,一根一根的减,还剩,15,9,=,6,5,1,10,把15分成10和5。10 9 11 5 6,15,9,=,6,5,4,10,把9分成5和4。15 5 1010 4 6,9+( )=15,159=( ),6,6,9再填上6就是15了。9 6 1515 9 6,做一做,说一说,巩 固 练 习,有18只小狗,走了9只,还剩多少只?,18 9 ( )(只),9,17,9,8,课 堂 小 结,通过今天的学习,你们学会了什么?谁愿意说说十几减9怎样算才会又对又快呢?,

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