1、,10/16/2018,十几减5、4、3、2练习课,10/16/2018,看谁能算对.,12-4= 13-6= 11-2=15-6= 14-5= 13-5=11-3= 12-3= 12-6=14-6= 13-4= 11-5=12-5= 11-6= 12-4=,8,7,9,9,9,8,8,9,6,8,9,6,7,5,8,10/16/2018,检测: 一.计算:13-6= 12-4= 11-4=12-5= 11-3= 14-5=,7,8,7,7,8,9,10/16/2018,2.比大小: 11-3 7 12-3 8 11-4 913-5 9 11-5 5 12-5 9,智慧门,问题:(1)从图中你
2、能知道什么?要求的问题是什么?(2)能列个算式解决一下吗?(3)为什么用减法计算?(4)说说你是怎样计算的。,1. 列算式,并计算。,绿色圃中小学教育网http:/,11,_,5,6,13,4,9,_,11-,2,3,4,5,12-,3,4,5,11 2 =,9,11 3 =,8,114 =,7,11 5 =,6,12 3 =,9,12 4 =,8,12 5 =,7,13 4 =,9,13 5 =,8,4、有12只小鸡,我已经捉住5只,还有几只?,走进生活,12 - 5 = 7(只),10/16/2018,根据圆片图列出四道算式,加强练习:,4+ 8 =,12,8+4 =,12,12 4 =,8,12 8 =,4,10/16/2018,帮小鸟找找家,