Subtraction.
Subtraction.—An operation which consists in taking from a number called minuend (m) all the units and parts of units contained in another number called subtrahend (s). The result is called the difference (d) of the two numbers or the remainder of their subtraction.
Sign of Subtraction.—The sign of subtraction is a horizontal dash - placed between the minuend, written first, and the subtrahend. Thus: 84 - 38 = d; 84 - 38 = 46. Generally m - s = d.
To Prove a Subtraction.—Add from bottom to top the difference and the subtrahend; the sum must equal the minuend.