A Treatise On Mental Arithmetic, In Theory And Practice (Hardcover) (ISBN-13: 9781020999123)

A Treatise on Mental Arithmetic in Theory and Practice, written by Isaiah Steen, is a comprehensive guide to mental calculations that covers everything from addition and subtraction to fractions and decimals. This invaluable resource is perfect for students, teachers, and anyone interested in improving their math skills.

This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it.

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