“两位数加减两位数”是小学二年级数学的重要教学内容之一,它是学生进一步学习整数加法的基础,是学生必须掌握的基础知识。小学二年级的学生活泼好动,对新鲜事物充满好奇心和浓厚的兴趣,富有探究的精神,学习具有极高的积极性和主动性。充分考虑二年级小学生的特征,发挥Flash软件集成性强、交互性好、文件小等优 “Double digit plus or minus two ” is one of the important teaching content of the second grade of primary school. It is the basis for students to further learn integer addition and is the basic knowledge that students must master. The sophomores in primary school are lively and active, full of curiosity and interest in new things, full of exploration spirit and high motivation and initiative. Give full consideration to the characteristics of sophomore primary school students, play Flash software integration, good interaction, small files and other advantages