Practical and Mental Arithmetic, on a New Plan, in Which ...
Smith, Roswell Chamberlain Excerpt from Practical and Mental Arithmetic, on a New Plan, in Which Mental Arithmetic Is Combined With the Use of the Slate: Containing a Complete System for All Practical Purposes, Being in Dollars and CentsThe blocks, illustrative of the rule for the Cube Root, will satisfactorily se count for many results in other rules as, for instance, m Decimals, Mensura tbn, &c., , which the pupil, by any other means, might fail to perceive. By observ...