TY  - BOOK
AU  - Williams, G. Arnell
TI  - How math works: a guide to grade school arithmetic for parents and teachers 
SN  - 978-1-4422-1874-1
U1  - G.S. 372.7 W723 2013 
PY  - 2013///
CY  - Maryland
PB  - Rowman & Littlefield Publishers
KW  - Arithmetic - Study and teaching (Elementary)
N1  - Includes bibliographies and index
ER  -