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,快乐的小鸭,（建议一课时完成）,BS,一年级下册,一,加与减（一）,课后作业,探索新知,当堂检测,课堂小结,十几减,7,，,6,的退位减法,1,课堂探究点,2,课时流程,口算。,11,9,11,8,13,9,16,9,12,8,14,8,15,9,15,8,12,9,17,8,14,9,13,8,17,9,16,8,18,9,2,7,4,3,4,7,6,6,3,5,5,9,8,9,8,探究点 十几减,7,，,6,的退位减法,草地上还有多少只？,答：草地上还有,_,只。,12,7,5,12,7,5,10,2,12,7,5,2,5,7,5,12,12,7,5,5,12,7,5,工具箱,1,1,6,5,1,4,6,8,算一算，摆一摆。,1,圈一圈，填一填。,计算,15,7,。,小试牛刀,（源于,典中点,）,15,7,5 2,想：,15,5,10,2,8,10,8,(,圈一圈略,),15,7,10,想：,10,5,想：,7,15 15,7,3,7,8,5,8,8,3,8,2,画一画，填一填。,11,6,(2) 14,7,(,画一画略,),7,5,3,11,9,11,7,13,7,14,6,13,6,17,7,12,6,15,6,16,7,12,7,15,7,16,8,2,4,6,8,7,10,6,9,9,5,8,8,4,(1),12,5,(2),6,9,15,15,6,9,或,9,6,15,15,9,6,计算十几减,7,，,6,的退位减法时可以用破十法、平十法、想加算减法等来计算。,归纳总结：,1.,算一算，用小棒或计数器说明你的计算过程。,工具箱,夯实基础,（教材,P7,练一练）,14,7=12,6=,7,6,2.,画一画，填一填。,3,3,13,6=,7,11,4,6,8,14,14,6,8,或,8,6,14,14,8,6,4.,看谁一次能算对。,15,6,12,7,13,7,11,6,16,7,14,6,15,7,13,6,9,5,6,5,9,8,8,7,5.,小熊射门。,7,6,13 (,个,),或,6,7,13,或,13,6,7,或,13,7,6,5,填一填，圈一圈。,(,得数是几就圈几个,),(1) 13,6,(2) 11,7,易错辨析,（选题源于,典中点,）,辨析：本题容易错在惯性思维，在讲算法时一般是圈去掉的部分，而本题要求圈得数，审题一定要认真。,(,圈一圈略,),7,4,
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