TY  - BOOK
AU  - Alfarez, Merle S.
TI  - Mental math tricks: on problem solving techniques 
SN  - 9789718740897
AV  - QA 135.6 .Al385 2014
PY  - 2014///
CY  - Quezon City
PB  - MSA Publishing House
KW  - Mathematics
ER  -