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Commas are used to delineate every third (thousands)digit. Full stops/periods are only used to separate digits from decimals.

e,g 123456789

Commas. 123,456,789 ; said as 'One hundred and twenty three million, four hundred and fifty six thousand, seven hundred and eighty nine.

Decimal 123,456.789 ; said as ' One hundred and twenty three thousand, four hundred and fifty six, point seven eight nine'..

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lenpollock

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Q: When are commas necessary to include with numbers?
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