Download 2.2 Algebra 1 Section 2.2

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
1.
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
Identify the property
6+0=6
Associative property
(a+b)+c = a + (b+c)
7+9=9+7
Identity property
a+0=a
(3+2) + 4 = 3 + (2+4)
Inverse property
a + (-a) = 0
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