Short-cuts in arithmetical calculations.
Medina, F A.
Short-cuts in arithmetical calculations. - Manila, Philippines : National Research Council of the Philippines, c1980.
rithmetica.
F QA 111 M346 1980
Short-cuts in arithmetical calculations. - Manila, Philippines : National Research Council of the Philippines, c1980.
rithmetica.
F QA 111 M346 1980