Developing computational skills / Marilyn N. Suydam, 1978 yearbook editor, Robert E. Reys, general yearbook editor. Suydam, Marilyn N. Reys, Robert E. National Council of Teachers of Mathematics. Arithmetic Study and teaching. QA1 .N3 1978 QA135.5 510.7 SUD Includes index. Reston, Va. : National Council of Teachers of Mathematics, c1978. c1978. 1978 Text viii, 245 p. : eng Yearbook - National Council of Teachers of Mathematics ; 1978 Yearbook (National Council of Teachers of Mathematics) ; 1978.