What is 1.66667 to the nearest one tenth?

Well, isn't that a happy little number! When we round 1.66667 to the nearest tenth, we look at the digit in the second decimal place, which is 6. Since 6 is 5 or greater, we round up. So, 1.66667 rounded to the nearest tenth is 1.7. Just like that, we've created a beautiful, rounded number to work with.