When numbers are used to represent numbers, these counting units should be arranged in a certain order, and their positions are called numbers.
Number of digits: a number contains several digits, that is, several digits. For example, 652 100 is six digits.
According to our country's counting habit, starting from the right, every four digits are one level.
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To understand large numbers, we should first divide all the numbers into three levels, ten thousand levels and one level from the numerical sequence table. From right to left, it is one, ten, one hundred, one thousand, ten thousand, one hundred thousand, ten million, one billion, ten billion, one hundred billion and so on. 10 ten thousand is one hundred thousand, 10 ten thousand is one million, 10 one million is ten million, 10 ten million is one hundred million.