Mavis drives = 634 miles.
Mavis visits her grandmother 4 times.
That means, she drives 634 miles each time when she visits her mother.
One time round trip Mavis's house to her gramdmother in philadelphia = 634 miles.
If she visited 4 times, we can multiply one round trip distance by 4 or we can just add that distance four times.
Let us try it by multiplying 4 by 634 .
If we multiply 4 by 634, we get 2536.
Therefore, 2536 miles Mavis drives if she visits her grandmother 4 times.
