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In English, commas are often (but not always) used to separate powers of 1000 when writing a number. For instance, three million, five hundred and ninety two thousand, four hundred and seventy five might be written as 3,592,475. Note that it is perfectly valid to skip the commas, as they are not actually a mathematical operator, but an aide for legibility. Decimals (the same symbol as a period in writing), play a more important role, marking where our "ones" column is when expressing non-integers. For example, 2.718 is a non-integer, equal to 1359/500. Without that decimal though, it would be read as two thousand, seven hundred and eighteen.

Note that this is the notation we use in English, but it is not universal, In French for example, the commas are replaced with spaces, and the decimal with a comma. For example, the number:

203,497.94

would instead be written as:

203 497,94

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Q: What do commas and decimals mean in math?
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