The unit 1, the understanding of large numbers:10000 is ten thousand,1010000 is one hundred thousand,1000000 is one million, and1010000 is ten million. 10 ten million is one hundred million, 10 one billion is one billion, 10 one billion is ten billion, 10 one hundred billion is one hundred billion. Ten, one hundred, ten thousand, one hundred thousand, one million, ten million, one billion, one billion ... are all units of counting. According to our country's counting habit, starting from the right, every four digits are one level.
Digital sequence table
Several levels ... hundreds of millions, tens of thousands, units, numbers ... hundred billion, one billion, one billion, ten million, one million, one hundred thousand, ten thousand, one hundred, ten, one unit; Counting unit ..............................................................................................................................................................................
The counting method with the ratio of 10 between every two adjacent counting units is called decimal counting method. When reading, just add the words "10,000" or "100 million" at the end of each level; The о at the end of each level is not read, and other numbers have a zero or several zeros, all of which are read-only.
When writing numbers, 10,000-level and 100-million-level numbers are written according to the method of one-level numbers, which one is not enough to be supplemented. To rewrite the number in units of "10,000" or "100 million", just delete the four zeros or eight о at the end, or add the words "10,000" or "100 million". 1。 Rewrite multiple numbers into "10,000" and "100 million". We usually use the method of "rounding" to omit the mantissa and find the approximate number of a number.
way
Look at the number with the highest mantissa. If it is 4 or less, the mantissa is discarded and the counting unit of "10,000" or "100 million" is added to the mantissa; If it is 5 or more, add 1 to the previous digit, then discard the mantissa and add a counting unit of "10,000" or "100 million". Get a rough figure, with an "S" in the middle.