For whole numbers, determining place values is super easy. I'll show you how.
First of all, let's establish some of the place values. Let's just use 12345 as our number.
<u>1</u> - ten-thousands, <u>2</u> - thousands, <u>3</u> - hundreds, <u>4</u> - tens, <u>5</u> - ones.
This list goes on and on, as numbers get bigger. Some more place values are ones, tens, hundreds, thousands, hundred-thousands, millions, ten-millions, hundred-millions, billions, etc.
Now, let's go to the number 8091. In this number there's only 4 place values.
<u>8</u> - thousands
<u>0</u> - hundreds
<u>9</u> - tens
<u>1</u> - ones
You now have your answer. The place value of 8 in 8091 is <em>thousands</em>.
Hope this answer helped you out. :)