TY  - BOOK
AU  - Lacsamana-Jensen,Paz A.
TI  - Speed math: subtraction and division 
SN  - 9789712717888
PY  - 2006///
CY  - Pasig City
PB  - Anvil Pub.
KW  - Arithmetic -- Problems, exercises, etc
KW  - Arithmetic
N1  - Includes bibliographical references
ER  -