How do you write 9000 thousandths as a decimal number?

To write 9000 thousandths as a decimal number, you would divide 9000 by 1000 since there are 1000 thousandths in one whole unit. This division would give you 9, which means 9000 thousandths is equal to 9 as a decimal number. Therefore, 9000 thousandths written as a decimal number is 0.009.