What is 1.66666667 rounded off?

When rounding off a number to a certain decimal place, you look at the digit immediately to the right of that decimal place. In this case, the digit after the hundredths place (the 7) is greater than or equal to 5, so you round up the digit in the hundredths place (the 6) by adding 1. Therefore, 1.66666667 rounded off to two decimal places is 1.67.