It does not, since it is not a digit.
As 5 digits, it looks like 10000.
which digit is in the ten thousands place in 489,051
The 7 is in the ten-thousandths place. There is no digit in the ten thousands place.
The ten-thousands place is the fifth (5th) digit to the left of the decimal point: 12,345.2
15 ten thousands = 150,000 15 ten thousandths = 0.0015
Look at the digit to the right of the ten thousands digit - the thousands digit; if it is 5 or more round up, if it is less than 5 round down. The thousands digit (the 4th before the decimal point which is hiding at the end) is a 2 which is less than 5, so round down: 452,906 → 450,000 to the nearest ten thousand.
Look at the digit in hundreds place. If it is five or greater, round the digit in thousands place to the next higher digit. If the digit in hundreds place is less than five, leave the digit in thousands place as it is. 755,082 rounded to thousands is 755,000.
8
Zero
2
It is a digit, in the ten thousands' place.
8
902798 has 0 in the ten-thousands place