一年级数学下册第2单元《20以内的退位减法》2.1《十几减9》作业新人教版.docx

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1十几减 9基础题1. 填空题。 15-9=( ) 想: 9 加( )等于 15, 15 减 9 等于( ) 。 12-8=( ) 想:10 减 8 等于( ) , ( )加 2 等于( ) 。8+( )=12 6+( )=14 8+( )=15 9+( )=162.在里填入“” 、 “”或“” 。9+818 18-9711-92 18-9914-96 17-983. 小明家住在 18 楼,他想自己步行上楼,他已爬了 9 层楼的台阶,他还要再爬多少层楼的台阶?能力题1.拿走 9 根,还剩下几根?2.提升题18 个同学排成一行上台为获奖者献花,从左往右数,亮亮是第 6 个,从右往左数,伟伟是2第 8 个。那么亮亮和伟伟中间有几个同学?答案和解析基础题1.6、62、2、4、8、7、72.、3.18-9=9能力题1.16-9=7 14-9=52.4+9=13 9+4=13 13-9=4 13-4=9提升题18-6-8=4【解析】

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