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1、吨的认识,一只鹦鹉大约重150（ ）,一只小鸡大约重100（ ）,一只东北虎大约重350（ ）,一头大象约重5（ ）,克,克,千克,吨,一、复习导入,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,二、探索新知,计量较重的或大宗物品的质量，通常用吨（ t ）作单位。,1吨有多重呢？,2吨,60吨,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状
2、元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,10个100千克是1000千克。,每袋大米重100千克，10袋大米重多少千克？,1吨=1000千克,感受1吨有多重,1、小组内互相说一说自己的体重； 2、同桌之间背一背，感受1个同学的重量。,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状
3、元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,10名这样重的同学大约 重多少千克？,40名这样重的同学大约重多少千克？,10名这样重的同学约重250千克。,40名这样重的同学约重1吨！,25千克,说说日常生活中什么东西可以用吨作单位,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成
4、才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,4吨（ ）千克,3000千克（ ）吨,想：1吨是1000千克，4吨是（ ）个1000千克。,想：1000千克是1吨，3000千克里面有（ ）个1000千克。,4,4000,3,3,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成
5、才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,一只大象重6000千克， 也就是（ ）吨。,一辆卡车载质量5吨，也就是（ ）千克。,6,5000,1、把动物和合适的体重连起来。,50吨 80千克 6千克 4吨,三、巩固提高,基础巩固,2、单位换算我能行。,3吨=（ ）千克 1000千克=（ ）吨 2吨-1000千克=（ ）千克 3吨+2000千克=（ ）吨 3吨600千克=（ ）千克 1吨+200千克=（ ）千克,3000,1,1000,5,3600,1200,基础巩固,3、我是小法官。,5吨棉花比5吨的铁轻。 （ ） 小明的身高是13分米，体重是34吨。 （ ） 克、千克、
6、吨都是质量单位，相邻单位间的进率都是1000。 （ ） 2吨比1999千克多1千克。 （ ）,4、读一读下面的日记，把错误的改正过来。,我的早晨 2018年9月12日 晴 今天早上6：30，我就起了床，很快地刷了牙、洗了脸，然后吃了一个70千克的鸡蛋，喝了一杯大约250克的牛奶，就背起2克重的书包匆匆忙忙上学去，走着走着，突然听到有人叫我的名字，我一看，发现原来是我们班体重只有20吨的瘦个子李林。于是我和他边走边聊，正准备过公路时，不巧一辆载满6千克水泥的大货车开过来了，我们只好收住脚步，让车先行。等我们跑到教室，其他同学早就在读书了。,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,四、课堂小结,计量较重的或大宗物品的质量，通常用吨（ t ）作单位。,1吨=1000千克,
