[苏教版]三年级上册数学长方形和正方形 平移、旋转和轴对称期末复习教学课件.pptxVIP

一 两、三位数乘一位数 ·························································· 1二 千克和克 ········································································· 28三 长方形和正方形 ································································ 36 周长是多少 ······································································ 46四 两、三位数除以一位数 ······················································· 48五 解决问题的策略 ································································ 71 间隔排列 ········································································· 78六 平移、旋转和轴对称 ·························································· 80七 分数的初步认识（一） ······················································· 87 多彩的“分数条” ····························································· 96八 期末复习 ········································································· 98 苏教版 三年级上册长方形和正方形 平移、旋转和轴对称 长方形和正方形长方形和正方形的特征（边和角）周长的含义平面图形的周长长方形的周长正方形的周长系统梳理【单击文字跳转链接】 平移、旋转和轴对称平移（朝某一个方向）旋转(绕某一个点)轴对称图形【单击文字跳转链接】 整理复习1长方形和正方形的特征【点击返回】长方形正方形相同点边角不同点都有4条边都有4个角，且都是直角对边相等四条边都相等 物体某个面一周边线的长度，称为这个面的周长。2周长的含义【点击返回】 3平面图形的周长长方形正方形（长+宽）×2边长×4周长C = 2abC = 4a【点击返回】 4平移物体沿着直线方向运动。 物体的的形状、大小和本身的方向都不改变，只是位置发生了变化。平移【点击返回】 5旋转物体围绕着一个点或一个轴转动。旋转 物体的的形状、大小都不改变，只是本身的方向和位置发生了变化，这就是旋转的特征。【点击返回】 沿一条直线对折后折痕两边能够完全重合的图形。6轴对称图形【点击返回】 随堂练习1. 先量一量，再计算每个图形的周长。1cm2cm2cm2+1+1=5（cm）1cm2cm2cm3cm2+2+3+1=8（cm）1cm1×6=6（cm）【选自教材第100页 第15题】 2. 一块长方形菜地，长20米，宽8米。如果要给这块菜地围上篱笆，篱笆的长是多少米？（20 + 8）× 2 = 56（米）答：篱笆的长是56米。【选自教材第100页 第16题】 3.是平移的画“√”，是旋转的画“○”。√√○○【选自教材第100页 第17题】 2. 下面的消防安全标识， 哪些可以看作轴对称图形？√√√√【选自教材第100页 第18题】 通过这节课的学习活动，你有什么收获？课堂小结