# 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 Cents (Classic Reprint)

Fb&c Limited, 31 Οκτ 2018 - 286 σελίδες
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 Cents

The 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 observing these, he will see the reason why his product, in decimals, should be aess than either factor as, for instance, why the solid contents of a half an inch cube should be less than half as much as an inch cube. In this case, the fac tors are each half an inch, but the solid contents are much less than halfa solid inch.