The commas between numbers in place value are commas.
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they are expressions
There is no difference. In both cases, the place value, of any digit, is ten times the place value of the digit to its right.
A group of three digits separated by commas in a multidigit number is typically referred to as a "thousands separator." This format is used to enhance readability by breaking large numbers into manageable parts, such as 1,000 or 1,000,000. The commas indicate the transition between thousands, millions, and so on, helping to distinguish the value of each segment.
It is easier to 'read' numbers when they include the commas. We therefore write this number as 9,130,032 This number is 'read' as: Nine million, one hundred and thirty thousand, and thirty two.
ALL numbers.