十几减8、7、6练习课(课堂PPT).ppt

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,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,*,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,*,十几减,8,、,7,、,6,练习,新人教版数学一年级下册,1,11,9=,12,9=,14,9=,15,9=,17,9=,18,9=,你发现了什么？,2,3,5,6,8,9,1,10,1,2,10,1,2,1,1,9,=,2,1,2,9=,3,1,3,9=,4,1,4,9=,5,1,5,9=,6,1,6,9=,7,1,7,9=,8,1,8,9=,9,。,十几减,9,，是几加,1,10-9=1,3,11,8=,12,8=,13,8=,14,8=,15,8=,16,8=,17,8=,你发现了什么？,3,4,5,6,7,8,9,1,10,2,2,10,2,4,1,1,8,=,3,1,2,8=,4,1,3,8=,5,1,4,8=,6,1,5,8=,7,1,6,8=,8,。,十几减,8,，是几加,2,5,11,7=,12,7=,13,7=,14,7=,15,7=,16,7=,你发现了什么？,4,5,6,7,8,9,1,10,3,2,10,3,6,1,1,7,=,4,1,2,7=,5,1,3,7=,6,1,4,7=,7,1,5,7=,8,1,6,7=,9,。,十几减,7,，是几加,3,7,11,6=,12,6=,13,6=,14,6=,15,6=,你发现了什么？,5,6,7,8,9,8,1,1,6,=,5,1,2,6=,6,1,3,6=,7,1,4,6=,8,1,5,6=,9,。,十几减,6,，是几加,4,9,破十法儿歌,退位减，我会算,十几减,9,，是几加,1,，,十几减,8,，是几加,2,，,十几减,7,，是几加,3,，,十几减,6,，是几加,4,，,十几减,5,，是几加,5.,10,11,8=,13,7=,13,6=,18,9=,15,8=,17,9=,11,7=,14,6=,3,6,7,9,7,8,4,8,15,9=,12,7=,13,9=,15,7=,11,6=,16,9=,17,8=,14,8=,6,5,4,8,5,7,9,6,11,15 9=6,16 8=8,14 7=7,14 6=8,18 6=12,17 4=13,16 4=12,15 1=14,个位能够减,不用退位减,个位不够减,要用退位减,12,9,5,8,2,6,15 6 13 8 14 7,17 9 11 9 12 6,7,送信,13,加油！加油！,2,5,8,11,3,9,4,6,10,7,书本,P15.2,14,书本,P15.3,13,8=5,15,8=7,16,8=8,12,8=4,11,8=3,14,8=6,17,8=9,10,8=2,12,7=5,14,7=7,16,7=9,13,7=6,11,7=4,15,7=8,11,6=5,15,6=9,14,6=8,16,6=10,13,6=7,1,3,8=,5,1,5,8=,7,1,6,8=,8,1,2,8=,4,1,1,8=,3,1,4,8=,6,1,7,8=,9,1,0,8=,2,1,2,7=,5,1,4,7=,7,1,6,7=,9,1,3,7=,6,1,1,7=,4,1,5,7=,8,1,1,6=,5,1,5,6=,9,1,4,6=,8,16,6=10,1,3,6=,7,15,16,我会算！,书本,P15.3,7,12,15,7,9,2,6,14,14,18,4,13,书本,P16.7,5,8,9,17,18,19,换奖品,儿童时代,8,分换一本,两次得分够换一本吗？,还多几分？,6+7=13,（分）,13-8=5,（分）,答：两次得分够换一本，还多,5,分。,20,