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.
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.
No Greek Acrophonic numbers do not have place value as they are not a positional system.