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,*,11-20各数的认识,11-20各数的认识,1,0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20,读直尺上的数。,0 1 2 3 4 5 6 7,2,( ),( ),( ),( ),( ),(,20,),10,13,14,18,19,12,15,16,11,17,做一做:,( ) ( )( )( )( )(20 )101,3,怎样数就能一眼看出?,怎样数就能一眼看出?,4,11-20各数的认识教学ppt课件,5,11-20各数的认识教学ppt课件,6,11-20各数的认识教学ppt课件,7,1个十,2个一,1个十2个一,8,1个十,2个一,1个十2个一,9,11,说说数的组成:,13,15,11说说数的组成:1315,10,19,20,(2个十就是20),1920(2个十就是20),11,你说摆法,我猜数。,你说摆法,我猜数。,12,11-20各数的认识教学ppt课件,13,11-20各数的认识教学ppt课件,14,你能找到它们吗?,你能找到它们吗?,15,19,11,18,12,13,17,14,16,20,15,19111812131714162015,16,11,12,13,14,15,16,17,18,19,20,11121314151617181920,17,20,19,18,17,16,15,14,13,12,11,20191817161514131211,18,11-20各数的认识教学ppt课件,19,