TY  - BOOK
AU  - Burton,Grace M.
ED  - National Council of Teachers of Mathematics.
TI  - Number sense and operations
SN  - 0873533194
U1  - 372.7 BUR 
PY  - 1993///
CY  - Reston, Va.
PB  - National Council of Teachers of Mathematics
KW  - Mathematics
N1  - Includes bibliographical references (p. viii)
ER  -