Modern conceptual arithmetic. /
Toralballa, Leopoldo.
Modern conceptual arithmetic. / Leopoldo V. Toralballa. - Manila : De La Salle University Press, c1984. - 59 p.: ill. 22 cm.
Arithmetic.
F QA 135.5 T63 1984
Modern conceptual arithmetic. / Leopoldo V. Toralballa. - Manila : De La Salle University Press, c1984. - 59 p.: ill. 22 cm.
Arithmetic.
F QA 135.5 T63 1984