Hunter & Grace Visit Morgan Run NEA: 11 Mystery Cache

My young friends Hunter and Grace (and, yes, their mom, JAB430) helped me place these hides.  We hope you find the actual hides interesting and a smidgen challenging.  As for the easy puzzles, they are in honor of my niece Georgea, who has had to solve such little math problems in her third-grade curriculum in Arizona.  So, you ARE at least as smart as a third-grader, aren't you?

On a group project, Georgea completed 240 math questions while Grace (two grades behind her sister) completed half as many.  Together they must complete 648 questions in order to qualify for top honors. 

Replace the last 3 digits of the North coordinates with 264 less than the number of questions the sisters have remaining to complete.

Replace the last 3 digits of the West coordinates with the number of questions the sisters have yet to complete.

You can validate your puzzle solution with certitude.