4824968
9781403481580
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Each title covers early techniques used to master the number operations, especially addition and subtraction, including spreads on doubling and sharing as precursors to multiplication and division. The first page dealing with each technique provides a simple explanation of that calculation method. This is followed by exercises using that technique, starting with very simple equations.Leffingwell, Richard is the author of 'Sharing and Dividing', published 2006 under ISBN 9781403481580 and ISBN 140348158X.
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