### Home > CC4 > Chapter 1 > Lesson 1.2.3 > Problem 1-63

1-63.

The District of Columbia has a very high population density. There are 646,449 people in 68.3 square miles. Homework Help ✎

Calculate the unit rate in terms of people per square mile for the District of Columbia. Make sure the precision of your answer is reasonable.

The problem indicates the rate is to be in terms of

**people**per**square mile**.This indicates a division problem.

But is this amount of precision

*reasonable*?

**Probably not!**

We should round our answer to the nearest whole person: 9465 people per square mile.Alaska is 570,374 square miles in area. If Alaska had the same population density as the District of Columbia, how many people would live in Alaska?

Each square mile would have a population density of 9465 people.