Places in the decimal system are based on powers of ten.
10^2 = hundreds
10^-2 = hundredths
10^1 = tens
10^-1 = tenths
10^0 = ones
Since zero doesn't have a negative counterpart, the ones column stands alone.
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A decimal point.
It is six, to one decimal place.
The 8 in 128.90 is in the place value column which is immediately before the decimal point - this is the ones column. The digit in 6.3457 which is in the ones place (immediately before the decimal point) is 6.
The tens place value is the second digit to the left of the decimal point. The decimal point is always to the right of the ones digit; in a whole number, the decimal point is "hiding" (not written) after the ones digit. In 3040 the tens digit is the 4.
It is the decimal point, although in some parts of the world a comma is used instead.