Question

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?

Answer 1

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.