TY  - BOOK
AU  - Jensen, Paz Alegria Lacsamana.
TI  - Calculations made easy: addition & multiplication subtraction & division 
SN  - 978-971-27-2648-4
PY  - 2012///
KW  - Mathematics
KW  - Study and teaching
KW  - sears
N1  - Includes bibliographical references
ER  -