本册教材根据《义务教育数学课程标准(2011年版)》(以下简称《课标》)的要求做了较大的修改和调整,使教学内容在安排上更加合理,在结构上更加科学,在呈现方式上更加规范,也更利于学生的学习和教师的教学。一、修订的内容本册教材的教学内容主要有:两位数乘两位数的乘法,三位数除以一位数的除法,小数的初步认识,长方形和正方形的面积,旋转、平移和轴对称,简单的统计活 The materials of this book have been greatly revised and adjusted according to the requirements of Compulsory Education Mathematics Curriculum Standard (2011 Edition) (hereinafter referred to as “Curriculum Standard”), which makes the teaching contents more reasonable in arrangement and more scientific in structure Rendering more standardized manner, but also more conducive to student learning and teaching of teachers. First, the revised content The teaching materials mainly include: two-digit by two-digit multiplication, three-digit division by one-digit, preliminary understanding of the decimal, rectangular and square area, rotation, translation and Axisymmetric, simple statistics live