TY  - BOOK
AU  - Schoen,Harold,L
AU  - Zweng,Marilyn J.
ED  - National Council of Teachers of Mathematics
TI  - Estimation and mental computation: 1986 yearbook ; Harold L. Schoen, Marilyn J. Zweng
SN  - 0873532260
U1  - 511.4 23
CY  - Virginia: 
PB  - National Council of teachers of Mathematics. , 1988
KW  - Mathematics
KW  - Problem solving
KW  - Arithmetic, Mental
ER  -