1. 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)
(-6)

2. 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)

3. 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

4. Simplify
4.8 + (-3.7) (-4.3) -⅓ ⅓

5. Example 4 page 74

6. assignment
Page 75 Problems even, all, even, 74,76