The Montgomery County board of education has adopted student assignment patterns for students now attending two schools in the New Hampshire Estates cluster in Silver Spring that will be closed.

Assignments also were made for students from three grades of another school.

The board last week closed Burnt Mills Elementary School as of July 1 this year, closed Hillandale Elementary School effective July 1, 1978 and decided to operate New Hampshire Estates Elementary School as a Head Start school through grade 3 beginning in September. The school now includes Head Start through grade 6.

The board this week decided that all Burnt Mills students will attend Jackson Road next year; grades 4 and 5 at New Hampshire Estates will attend Brookview next year and grade 6 at New Hampshire Estates will have the option of attending Hillandale or Brookview. In 1978-79, all Hillandale students north of the Naval Ordnance Lab will attend Cresthvan. Hillandale will continue to have kindergarten next year.

In other action, the board made decisions on two boundary changes. Students from the Tanager Lane area and adjacent streets in Potomac have been given the option of attending Wayside of Travilah Elementary schools. Students at Garrett Park Elementary School have been assigned to Tiden Junior High instead of Kensington, their current assignment.