Algebra 1 Section 2.2 Add real numbers Note: Addition of real numbers can be modeled on a number line. 6 + (-4) -3 + 7 -2 + (-5) -3 + 5 + (-6)

Rules for addition To add numbers with the same sign: a. Add their absolute values b. Keep their sign 2. To add numbers with opposite signs: a. Subtract their absolute values b. Keep the sign of the number with the largest absolute value -42 + (-86) 62 + (-15) -94 + 18

Properties of addition Commutative property a+b = b + a Associative property (a+b)+c = a + (b+c) Identity property a + 0 = a Inverse property a + (-a) = 0 Identify the property 6 + 0 = 6 7 + 9 = 9 + 7 (3+2) + 4 = 3 + (2+4) 8 + (-8) = 0

Simplify 4.8 + (-3.7) + 8.2 + (-4.3) -⅓ + 3 + ⅓

Example 4 page 74

assignment Page 75 Problems 12-32 even, 33-40 all, 44-52 even, 74,76