TY  - BOOK
AU  - Williams,G.Arnell
TI  - How math works: a guide to grade school arithmetic for parents and teachers 
SN  - 9781442218741
AV  - QA135.6 W544H
PY  - 2013///
CY  - Lanham, Md.
PB  - Rowman & Littlefield
KW  - Arithmetic
KW  - Study and teaching (Elementary)
N1  - Includes bibliographical references and index
ER  -