It takes the moon an average of 27.32167 days to circle the earth. Round this number to the closest thousandth.
The thousandths place is the third digit to the right of the decimal point (1). To decide whether to round up or to stay the similar, such as the digit to the right of the thousandths place (6). Since 6 is greater than or equal to 5 and you round up to 27.322.