Estimation and mental computation :  1986 yearbook / 
Harold L. Shoen, 1986 yearbook editor ; Marilyn J. Zweng, general yearbook editor. 
 - Reston, Va. :  National Council of Teachers of Mathematics,  c1986. 
 - viii, 248 p. :  ill. 
 - Yearbook / National Council of Teachers of Mathematics ;  1986 .
 - Yearbook (National Council of Teachers of Mathematics) ;  1986. .
<br/><br/><label>ISBN: </label>0873532260 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Problem solving.<br/>Estimation theory.<br/>Mental arithmetic
<br/><br/><label>LC Class. No.: </label>QA1  QA63  / .N3 1986 
<br/><br/><label>Dewey Class. No.: </label>510 s  511/.4�19