Medina, F.A. 4 0

Short-cuts in arithmetical calculations 6 6 - - - 247 pages. : illustration. 23 cm. - - - - - . - . - 0 . - . - 0 .

Includes index





5

















5







2 = =









2




2 --0------


6 --0-- 2 --------



0 2 --


--20------





Arithmetic. ----------


--------20--


----2

/ 2

/ 2

/

/

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