How Do You Place Commas in Numbers? There are many rules that are applied in the English Language, the most important being punctuation. We place full stops at the end of a sentence. We use quotation marks when we are using quoted text; question marks when there is a question being asked, exclamation for excitement, surprise, and commas when there are things more than one in a sentence. Just like the way they are used to align words in sentences, they are used in mathematics to align numbers. We often see in large numbers; there are often commas placed after a few values. For example: 2,254,807. Here, the they are placed to make the big number easier to understand and read. For every number that is bigger than the 999 value, commas are placed after 3 decimal values in each number.

They can often be used in very large numbers to make them easier to read and interpret. They can be placed every three digits to denote gaps of a thousand. There are three data points that contain numbers that we should not add commas to. You should not add them to serial numbers because it changes their function. They are often left out of reference numbers, you will notice this when you get a confirmation number for a hotel stay or plane ticket. They also are often left out 4-figure formats for the year (such as 2018). These worksheets explain how to correctly place commas in large numbers, and how to read the result. All numbers have either five or six digits.