《一年级数学下册课件-1.1十几减9- 苏教版(共14张PPT).pptx》由会员分享,可在线阅读,更多相关《一年级数学下册课件-1.1十几减9- 苏教版(共14张PPT).pptx(14页珍藏版)》请在taowenge.com淘文阁网|工程机械CAD图纸|机械工程制图|CAD装配图下载|SolidWorks_CaTia_CAD_UG_PROE_设计图分享下载上搜索。
1、9+2= 9+4= 9+8= 9+7=9+5= 9+6=9+3= 9+9=13 13 9 = 9 = (个)(个)我买我买9 9个。个。还剩多少个?还剩多少个?情境导入情境导入13 13 9 = 9 = (个)(个)先减去先减去3个,个,再减去再减去6个。个。4 4平十法平十法探究新知探究新知13 13 9 = 9 = (个)(个)从从10个里减个里减去去9个个4 4破十法破十法13 13 9 = 9 = (个)(个)9加加( )得得13,13减减9得得4。4 4想加算减想加算减413 13 9 = 9 = (个)(个) 4先减去先减去3个,个,再减去再减去6个。个。从从10个里减个里减去去9
2、个个9加加(4)得得13,13减减9得得4。平十法平十法破十法破十法想加算减想加算减你喜欢哪你喜欢哪种方法?种方法?返回12 12 9 =9 = 3 31.1.先圈一圈,再计算。先圈一圈,再计算。16 16 9 =9 = 7 7课堂练习课堂练习?个?个15 15 个个?根?根17 17 根根15 15 9 =9 = 6 617 17 9 =9 =8 82.2.9 92 =2 = 111111119 =9 = 2 29 95 =5 =141414149 =9 = 59 99 =9 = 1818189 =9 =93.3.129 = 3 4. .159 = 6 179 = 8 139 = 4 169 = 7 199 = 10 119 = 2 189 = 9 149 = 5 109 = 1 11119 =9 = 2 214149 =9 = 5 517179 =9 = 8 812129 =9 = 3 315159 =9 = 6 618189 =9 = 9 913139 =9 = 4 416169 =9 = 7 719199 =9 = 10105. .1.1.平十减平十减2.2.破十减破十减3.3.想加算减想加算减课堂小结课堂小结这节课你们都学会了哪些知识?这节课你们都学会了哪些知识?补充习题:补充习题:第第1 1页页课后作业课后作业