1,000,000 is 1 million
look at the previous digit
if it is less than 5 then leave the millions place as is and replace the following digits with zeroes
if it is equal to or greater than 5, add 1 to the millions place and replace the following digits with zeroes
296,386,482
3<5
round down (leave as is baseically)
296,000,000 is rounded
All the other stuff, east/west, doesn't matter.
He drives 3 miles north, then later on he drives 4 more miles north:
3 + 4 = 7
The dog show is 7 miles north of his home.