Simple Subtraction. In this class ... that they are in their seats in writing the Subtraction-table, and examples with their keys alternately, from the dictation of the monitor. While in ... of the key. Example in Simple Subtraction, with its key as it is 28.
|Title||:||Manual of the system of teaching reading, writing, arithmetic, and needle-work, in the elementary schools of the British and foreign school society|
|Author||:||British and Foreign School Society, Philadelphia Society for the Establishment and Support of Charity Schools|