They're simply used for clarity - to make the number easier to read.
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Commas are used to separate large numbers into groups of three digits. Each group is called a period.
It is a stupid question
Commas are used to separate large numbers into groups of three digits. Each group is called a period.
Three. One billion is written as 1,000,000,000.
In large numbers, a comma precedes every third number (counting from right to left). So, 3000000 should be written as 3,000,000.