The area of Greenland is 840,000 square miles. What is the scientific notation?

Scientific notation is a way of writing very large or very small numbers.

A number is written in scientific notation when a number greater than 0 and less than 10 multiplied by a power of 10.

In this case:

100,000 = 10⁵

840,000 = 8.4 • 100,000 = 8.4 • 10⁵

Scientific notation:

8.4 • 10⁵ sq mi