What is 6.6666 rounded to the thousandths place?

To round 6.6666 to the thousandths place, you look at the digit in the thousandths position, which is 6. The next digit, in the ten-thousandths position, is also 6. Since this digit is 5 or greater, you round up the thousandths digit from 6 to 7. Therefore, 6.6666 rounded to the thousandths place is 6.667.