How do you round 16.67 to one decimal place?

Look at the second(2nd) decimal place. If it is '5' or greater, then add '1' to the first decimal place. . Then drop the rest of the decimals.

Hence 16.67

The second decimal place is '7' , so it is greater than '5'. So add '1' to '6' = 7

Hence 16.7 Ignore any more decimals to the right.