资源描述
第,3,课时 星星合唱队,北师,二年级上册,说一说,合唱队人数比原来多了还是少了?,合唱队现在有多少人?,1,2,15,9,6,(人),52,6,58,(人),52,9,15,58(,人),43,15,58,52,9,43,答:合唱队现在有,58,人。,说一说,再列式算一算。,29+8-5=32,(岁),75-46+12=41,(本),1.,少了,48,2.,填一填。,56,94,52,79,60,3.,75-28-35=12,(个),4.,机灵狗有多少张画片?,56,(张),5.,商店里原来有,89,台电脑,卖出去,35,台后,又运进,18,台,现在商店,里有多少台电脑?,89+18-35=72,(台),课后作业,:,1.,从课后习题中选取;,2.,完成练习册本课时的习题。,情境导入,20,30,探究新知,十个十个地数,20,30,50,30,40,50,答:一共有,个果子。,50,20,30,50,拨一拨,还剩下多少个果子?,50,10,50,10,40,数一数,50,10,40,答:还剩下,个果子。,40,数一数,20,30,50,50,10,40,认一认。,加数,加数,和,被减数,减数,差,看一看,填一填。,30,50,80,90,30,60,课堂练习,算一算。,60,30,70,20,50,20,10,30,50,90,20,80,50,60,50,90,50,20,90,90,70,90,70,30,40,10,20,40,找孩子。,提出一个数学问题,并解答。,桃和梨一共有多少个?,30+40=70,(个),答:桃和梨一共有,70,个。,答案不唯一,
展开阅读全文