1) 66 west to exit 57B (Route 50 West) and stay straight to Centreville Road. Make right on Centreville Road and stay straight and Floris Elementary School will be on the left.
2) 66 East to exit 53A (Route 28 North) take Route 28 North to Maclearen Road, make left on Centreville, Road and stay straight amd Floris Elementary School will be on the left.
3) Take the Dulles Toll Road/267 to exit 10 Herndon which will put you on Centreville Road. Make left off of exit if heading west and right off of exit if heading east.