In the decimal system the place value of any digit is ten times that of the digit to its right. If using other bases a similar relationship applies. In the octal (base 8) system, for example, place value of each digit is eight times that of the digit to its right.
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The two sets of digits have different place values.
The decimal point isn't a fractor or a 'place' value.It only marks the boundary between . . .(place values = powers of ten from zero and up) . (place values = negative powers of ten)
they are expressions
I can see eight different place values to which that number could be rounded. The choice is yours. The answer is different for each one.
The first 9 is in the Millions place, the second is in the Hundreds. The difference is 4 orders of magnitude.