1-8Table 1-1. —Decimal Addition TableTo add 5 and 7 using the table, first locate one number in the X row and the other in the Y column.The point in field Z where the row and column intersect is the sum. In this case the sum is 12.SUBTRACTION.The following definitions identify the basic terms you will need to know tounderstand subtraction operations:SUBTRACTTo take away, as a part from the whole or one number from anotherMINUENDThe number from which another number is to be subtractedSUBTRAHENDThe quantity to be subtractedREMAINDER, or DIFFERENCEThat which is left after subtractionBORROWTo transfer a digit (equal to the base number) from the next higher order columnfor the purpose of subtraction.Use the rules of subtraction and subtract 8 from 25. The form of this problem is probably familiar toyou:It requires the use of the borrow; that is, you cannot subtract 8 from 5 and have a positive difference.You must borrow a 1, which is really one group of 10. Then, one group of 10 plus five groups of 1 equal15, and 15 minus 8 leaves a difference of 7. The 2 was reduced by 1 by the borrow; and since nothing isto be subtracted from it, it is brought down to the difference.Since the process of subtraction is the opposite of addition, the addition table 1-1 may be used toillustrate subtraction facts for any number system we may discuss.

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