TY  - BOOK
AU  - Schoen,Harold L.
AU  - Zweng,Marilyn
TI  - Estimation and mental computation: 1986 yearbook 
T2  - Yearbook / National Council of Teachers of Mathematics
SN  - 0873532260
AV  - QA1QA63 .N3 1986
U1  - 510 s511/.4�19 
PY  - 1986///
CY  - Reston, Va.
PB  - National Council of Teachers of Mathematics
KW  - Problem solving
KW  - Estimation theory
KW  - Mental arithmetic
ER  -