西师版二年级数学下册期末复习知识点(识记部分)
西师版二年级数学下册期末复习知识点(识记部分)一、万以内数的认识及三位数的加减法1、10个一是十,10个十是一百,10个一百是一千(1000),10个一千是一万(10000)。2、个、十、百、千、万都是计数单位,相邻两个计数单位的进率是10。3、数位顺序:从右起第一位是个位,第二位是十位,第三位是百位,第四位是千位,第五位是万位……一个四位数,最高位是千位。4、写数是从高位开始的,几千在千位上写几,几百在百位上写几,几十在十位上写几……哪个数位上一个计数单位也没有,就在这一位上写0。5、读数是从高位开始,千位上是几,读作几千,百位上是几,读作几百,十位上是几读作几十……末尾的0不读。中间有一个...
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