,www.youyi100.com,www.youyi100.com,www.youyi100.com,www.youyi100.com,www.youyi100.com,www.youyi100.com,www.youyi100.com,www.youyi100.com,www.youyi100.com,第 1 课时 数 数,这些羊大概有多少只？今天我们就来学习数数。,同学们数一数有几块？,再加2块呢？,接着再加3块呢？,你来估一估草地上有多少只羊，并说说你是怎么想的。,1,方法一：一个一个地数。,一根一根地数。,一个一个地数。,思考：还可以怎么数呢？,方法二：十个十个地数。,思考：哪种方法最简便呢？我们一起来看一看。,最简单、最快捷的方法：十个十个地数。,数小猪吹的泡泡。,有38个泡泡,你是怎么数的？怎样数会更快一些？,1.数数时，一个一个地数，几十九（九十九除外）后面都是整十数，九十九后面的数是一百。 2.（1）认识计数单位“一（个）”。一个一个地数，1,2,3，从一数到一百，计数单位是“一（个）”;,www.youyi100.com,www.youyi100.com,www.youyi100.com,www.youyi100.com,www.youyi100.com,www.youyi100.com,www.youyi100.com,www.youyi100.com,www.youyi100.com,（2）认识计数单位“十”。十个十个地数，从十数到一百，十、二十、三十计数单位是“十”； （3）认识计数单位“百”。100里面有1个百，计算单位是“百”。,www.youyi100.com,www.youyi100.com,www.youyi100.com,www.youyi100.com,www.youyi100.com,www.youyi100.com,www.youyi100.com,www.youyi100.com,www.youyi100.com,3.“一（个）”“十”“百”都是计数单位，它们的关系是：10个一是十，10个十是一百。一、十、百每相邻两个计数单位之间的进率都是10。,www.youyi100.com,www.youyi100.com,www.youyi100.com,www.youyi100.com,www.youyi100.com,www.youyi100.com,www.youyi100.com,www.youyi100.com,www.youyi100.com,更多教学资源内容，敬请关注,3334326094qq.com,www.youyi100.com,youyicongshu100,WWW.youyi100.com,www.youyi100.com,www.youyi100.com,www.youyi100.com,www.youyi100.com,www.youyi100.com,www.youyi100.com,www.youyi100.com,www.youyi100.com,www.youyi100.com,www.youyi100.com,www.youyi100.com,www.youyi100.com,www.youyi100.com,www.youyi100.com,www.youyi100.com,www.youyi100.com,www.youyi100.com,www.youyi100.com,