$Mental math$
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Mental math

Manylion Llyfryddiaeth
Prif Awdur:	Mariano, Ma. Luisa
Awdur Corfforaethol:	University of the Philippines. Open University
Fformat:	Llyfr
Iaith:	English
Cyhoeddwyd:	Quezon City UP Open University, Office of Academic Support & Instructional Services c2004.
Pynciau:	Mental arithmetic. Mathematics > Problems, exercises, etc.