There are 10 to the 6th power millimeters in one kilometer. The distance from Dana’s house to her uncles house is 4 to the 4th power kilometers. What is this distance in millimeters

The answer is essentially 4^4 * 10^6
4^4 is 256, and 10^6 = 1,000,000
Knowing this, the answer should be 256,000,000