TY  - BOOK
AU  - Bittinger, Marvin L.
AU  - Beecher, Judith A.
TI  - Develop mental Mathematics
SN  - 97812563466401
AV  - COL QA 139 .B54 2012 
PY  - 2012///
CY  - Boston
PB  - Pearson
KW  - Mental arithmetic -- problems, exercises
KW  - Mathematics -- problems, exercises
KW  - Mathematics -- study and teaching
ER  -