Lesson 5 SETSABSOLUTE VALUEADDITION OF SIGNED NUMBERS A

Lesson 5 SETS-ABSOLUTE VALUEADDITION OF SIGNED NUMBERS A SET is a well defined collection of numbers, objects or things. It is customary to designate a set by enclosing the members of the set within braces. SUBSETS OF THE SET OF REAL NUMBERS Natural Numbers = {1, 2, 3, …} Whole Numbers = {0, 1, 2, 3, …} Adds 0 to the set of Natural Numbers. Integers = {… -1, -2, -3, 0, 1, 2, 3 …} Includes the negatives of every natural number & 0.

ABSOLUTE VALUE Every number except zero has a numerical part and a sign i. e. -7 & +7. The numerical part designates the bigness of the number and we use the words ABSOLUTE VALUE to describe this quality. We define the ABSOLUTE VALUE of any nonzero number to be a positive number and the ABSOLUTE VALUE of zero to be zero. We enclose the number within vertical lines to indicate ABSOLUTE VALUE. Ex. : | 7 | = 7 and also | -7 | = 7

ADDITION OF SIGNED NUMBERS In arithmetic we used a minus sign to indicate subtraction. In algebra we use the minus sign to indicate a negative number. In algebra the operations of addition and subtraction are lumped together as ALGEBRAIC ADDITION. The sign in front of a number only indicates that the number is either positive (+) or negative (-). On Line Practice – Adding Signed Numbers More Practice And More Practice