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1. Understanding: 10 is one million, 10 is ten million, ten million is one billion, 10 is one billion, 10 is one billion.

One (1), ten, hundred, thousand, ten thousand, one hundred thousand, one million, ten million, one billion, ten billion and one hundred billion are all units of counting.

The forward speed of every two adjacent counting units is 10.

When numbers are used to represent numbers, these counting units should be arranged in a certain order, and their positions are called numbers.

brief introduction

The "knowledge tree" reveals for the first time that the structure, formation law and process of knowledge are exactly the same as the tree. This is the first time that human beings have discovered the close logical relationship among human culture, civilization and trees. Nowadays, the concept of "knowledge tree" has been widely used all over the world.