Since we are asked to estimate our answer to the nearest hundred miles, we can round each number of miles driven for the three days to the nearest hundred miles before adding them to find the total number of miles driven for the three days.
The value of the number in the tens place for 682 is 8, so 682 rounds up to 700.
The value of the number in the tens place for 538 is 3, so 538 rounds down to 500.
The value of the number in the tens place for 362 is 6, so 362 rounds up to 400.
Combining our rounded number of miles driven for the three days, we get:
700+500+400=1,600
You and your friends have driven about 1,600 miles.