Fair. No Jacket. Size: 8vo 6 1/2" x 9 1/2" tall; D. Van Nostrand Hardcover no Jacket Fair Condition. Navy cloth over boards, scuffed lower corners, circular stain on front cover, spine ends, bump with some scuffing. Lower edge is scuffed, lower edge of text block is smudgy. This publication combines in one volume those methods and techniques which will give a greater skill and dexterity in calculations of all kinds. The first approach consists of methods for performing arithmetical calculations quickly, including ways of solving problems mentally. The next step in making calculations quickly is by means of a mechanical device-the slide rule. Of course this is dated but great practice. Finally, the most effective way of all to achieve facility and skill in the use of figures is by the many recreations and pastimes which have been developed as a source in mathematics. Great for homeschoolers and in-school learners. D. Van Nostrand Company, Inc., New York; 1939; 5"x7" tall; Rapid Mathematics (Number one above) by T. O'Conor Sloane; 1922, viii, 184pp. A Manual of the Slide Rule by J.E. Thompson; 1930, vii, 220pp. Recreations in Mathematics by H. E. Licks; 1917, iv, 155pp with Appendix of Solutions.
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