数 的读写教学，分万以内数的读写、亿以内数的读写和亿以上数的读写三个阶段。其中，万以内数的读写是基础，亿以内数的读写是关键，亿以上数的读写是发展。教师应重点教好亿以内数的读写，使其真正发挥承前启后的作用。一、数数打基础，“分级”是关键教学亿以内数的读写，先 Number of reading and writing teaching, reading and writing within a few million, reading and writing within the number of billions and hundreds of millions of literacy read and write three stages. Among them, the number of literary and literary reading and writing is the foundation, literacy and literacy are the key points, and reading and writing of more than one hundred million are the development. Teachers should focus on teaching hundreds of millions of reading and writing, so that it can really play the role of predecessor. First, the number of playing the foundation, “grading” is the number of key teaching read and write, first