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Commas are used to separate large numbers into groups of three digits. Each group is called a period.
Commas are used to separate large numbers into groups of three digits. Each group is called a period.
To write 400 thousand in numbers, you would write 400,000. This is a standard way to represent large numbers using commas to separate the thousands, millions, billions, etc. In this case, 400 is followed by three zeros to indicate the thousands place.
In large numbers, a comma precedes every third number (counting from right to left). So, 3000000 should be written as 3,000,000.
They're simply used for clarity - to make the number easier to read.