TY  - BOOK
AU  - Richardson, Kathy
TI  - How children learn number concepts : : a guide to the critical learning phases 
SN  - 9780972423809
AV  - QA135.6  .R53 2012
PY  - 2012///
CY  - Bellingham, Washington : 
PB  - Math Perspectives, 
KW  - Mathematics
KW  - Study and teaching (Elementary)
KW  - Number concept
N1  - include Bibliography
ER  -