How To Calculate Quickly Full Course In Speed Arithmetic Dover Books On Mathematics
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How to Calculate Quickly
Many useful procedures explained and taught: 2-column addition, left-to-right subtraction, mental division of large numbers, more. Also numerous helpful shortcuts. More than 8,000 problems, with solutions. 1945 edition.
The Thirteen Books of Euclid's Elements
Contains the complete English text of all thirteen books of the "Elements," along with critical analysis of each definition, postulate, and proposition.
The Thirteen Books of the Elements, Vol. 1
Volume 1 of 3-volume set containing complete English text of all 13 books of the Elements plus critical analysis of each definition, postulate, and proposition. Vol. 1 includes Introduction, Books I and II: Triangles, rectangles.