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单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,9,加几,SJ,一年级上册,十,20,以内的进位加法,小熊笨笨过生日,小熊笨笨一家共,5,口人,它过生日时,笨笨的,9,个好朋友都来参加它的生日聚会。切蛋糕时,熊,妈妈问笨笨:“应该切成多少块呢?”,课后作业,探索新知,当堂检测,课堂小结,9,加几的计算方法,1,课堂探究点,2,课时流程,一共有多少个?,9,4,=,(个),把,9,凑成,10,,很快就知道。,探究点,9,加几的计算方法,1,3,一共有多少个?,9,4,=,(个),13,10,先圈出,10,朵,再填一填。,1,6,9,7,=,16,10,小试牛刀,(教材,P88,试一试),1.,再放,1,块,就是,10,块。,5,9,6,=,15,10,1,小试牛刀,(教材,P89,想想做做),4,9,5,=,14,10,1,2.,先圈出,10,根,再计算。,9,3,=,12,9,8,=,17,3.,9,1,1=,11,9,2=,11,9,1,8=,18,9,9=,18,4.,5.,9,1=,10,9,4=,13,9,7=,16,9,2=,11,9,5=,14,9,8=,17,9,3=,12,9,6=,15,9,9=,18,小试牛刀,(选题源于,典中点,),一、先圈出,10,个,再计算。,1,4,10,14,1,8,10,18,圈出,10,个略。,二、看图列式计算。,9,6,3,15,12,9,12,14,3,算一算。,16,18,10,9,11,13,15,17,用“凑十法”计算,9,加几,可以“拆大数凑小数”,也可以“拆小数凑大数”,还可以先交换加数的位置再计算。,归纳总结:,夯实基础,(,教材,P90,练习十一,),1,.,1,2,10,12,1,7,10,17,1,8,10,18,9,3,9,8,9,9,2,.,11,13,15,17,18,16,14,12,9,2,4,6,8,9,9,7,5,3,3,.,9,1,10,9,2,11,9,3,12,9,4,13,9,5,14,9,7,16,9,8,17,9,9,18,4,.,9,2,11,9,6,15,5,.,9,4,9,9,9,5,9,7,9,8,9,2,9,6,9,3,13,18,14,16,17,11,15,12,6,.,5,4,7,3,6,5,1,8,4,9,2,10,16,14,13,1,(人),原来有,(),人在溜冰,又来了,(),人,,一共有多少人?,7,.,看图填一填,再计算。,9,3,9,3,12,(盆),原来有,(),盆花,又搬来,(),盆,一共有多少盆?,9,4,9,4,13,10,15,易错辨析,(选题源于,典中点,),四、照样子,填一填。,辨析:熟练掌握凑十法。,1,7,17,1,2,12,1,3,13,yFdfFtEJJZ|+_A4CVBN)(yFdfFtEJJZ|+_A4CVBN)(,
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