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1、九年义务教育人教版小学数学第一册第七单元,1120各数的认识,教师:彭茂丽,返回,12,12,10个一,1个十,是,12,15,14,17 ?,16 ?,16,11,13,18,2个十,20,是,0,0,0,1,0,1,2,0,1,2,3,0,1,2,3,4,0,1,2,3,4,5,0,1,2,3,4,5,6,0,1,2,3,4,5,6,7,0,1,2,3,4,5,6,7,8,0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,10,0,1,2,3,4,5,6,7,8,9,10,11,0,1,2,3,4,5,6,7,8,9,10,11,12,0,1,2,3,4,5,
2、6,7,8,9,10,11,12,13,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16
3、,17,18,19,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,14,17,从7数到17,从11数到20,17,15和17,一个一个数,两个两个数,五个五个数,1个十,1个十,6个一,？,16,2个十,20,抢答题:,（1）15是由( )个十和( )个一组成,（2）( )个十和( )个一组成17,（3）16前面一个数是( ),后面一个数是( ),（4）与19相邻的两个数是( )和( ),1,1,15,18,5,7,17,20,再见,