“加、减法的一些简便计算”是九年义务教育六年制小学数学第七册第二单元的内容。我从说教材、说教法、说学法、说教学程序这四个方面来阐述我对教材的理解和设计意图。一、说教材１ 教学内容的地位、意义和作用“加、减法的一些简便计算”是在学生掌握了亿以内数加、减法的基 “Some Addition and Subtraction Simple Calculation” is the content of the second unit of the seventh book of mathematics of six-year compulsory education in nine-year compulsory education. I said from the teaching materials, preaching, learning theory, teaching procedures that these four aspects of my understanding of the teaching materials and design intent. First, the teaching material 1 teaching content status, meaning and role of “add, subtract some of the simple calculation” is to master the number of students within the plus and minus, subtract the base