Excerpt from A Key to the Standard Arithmetic and the Mental Arithmetic Since 100 sheep remained after selling 60, he must have had at arst 160 sheep. About the

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Excerpt from A Mental Arithmetic The study of Mental Arithmetic has two principal objects in view, to discipline the mind and impart quickness and accuracy in m

Excerpt from American Mental Arithmetic There are 45 different combinations of figures taking two at a time, viz.. About the Publisher Forgotten Books publishes