The population of new york city in 2000 was 8,008,278. what was the order of magnitude of the population of new york city?

For the answer to the question above,  
If you know how to write numbers in exponential notation, that would give you the answer right away. 

8,008,278 = 8.008278 x 10^6 people. 

The order of magnitude is the value of the exponent, 6. 

Or keep the 8, then count the number of places left = 6.

Fine until slavery ya ya haha