What is the order of magnitude for the number of great lakes?
There are 5 great lakes. The order of magnitude of the number 5
is 0.
Order of magnitude is determined by powers of 10. So, 150 would
be order of magnitude of 2, since you could write 150 as 1.5 * 102.
Similarly, 5 can be written as 5 * 100, so the order of magnitude
is 0.