Mary Jane Camplair, 56, a former mathematician and school teacher who served on her church council, died of cancer Tuesday at her home in Annandale.

Mrs. Camplair was born in Princeton, W. Va., and graduated from Randolph-Macon Woman's College in Lynchburg, Va., where she was a member of Phi Beta Kappa.

She was a civilian mathematician with the Army here from 1945 to 1948 and, from 1962 to 1967, taught mathematics at the Kubal International School in Afghanistan, where she accompanied her husband, George H. Camplair, then a State Department cartographer, on an assignment for the agency for International Development.

In the 1970s, she taught at the Glasgow Intermediate School and the Schefer School in Alexandria and was a substitute teacher in Fairfax County public schools.

Mrs. Camplair lived in the Washington area for the last 36 years and was a member of the Lutheran Church of the Reformation in Washington for 35 years. She was a member of the church council at the time of her death.

She and her husband were members of square dancing clubs in Maryland and Virginia.

In addition to her husband of Annandle, survivors include a daughter, Nancy L. Phelps of Portland, Ore.; two sons, G. Martin, of Akron, Ohio, and Christopher W., of Richmond; her mother, Mrs. William B. McNutt of Staunton, Va.; a brother, the Rev. Charles W. McNutt of Charleston, W. Va. and four granddaughters.

The family suggests that expressions of sympathy be in the form of contributions to the Capitol Hill Holistic Center at the Lutheran Church of the Reformation in Washington.