1. Objective: Students will add and subtract groups of integers.
October 8, Math 102
Objective: Students will add and subtract groups of integers.
Aim: How do we use the Associative Property of Addition to add and subtract integers?
NYS Mathematics Standards: 7.N.12
Prior Knowledge: Think of two examples of adding and subtracting integers in daily life.

2. Mini-lesson:
To add and subtract integers, begin by rewriting each subtraction as addition. Then add from left to right.
5 – =
5 + (-6) + 2 = = 1

3. Use the Associative Property of Addition to make solving problems easier. The order in which you group numbers does not change the answer.
Example:
Simplify
(3 + 6) + (-6) = 3 + (6 + (-6))
= 3 + 0
= 3

4. Group Practice:
Write each subtraction as addition.
Use the Associative Property of Addition to group integers and simplify.

5. Independent Practice:
Assessment:
(( ) + 18 = (-17) + ( ) is an example of which property?
2. Rewrite the subtrction expression as asn addition expression: 23 – 9 – (-18). Then simplify.
Homework: Math Triumphs Book 3, p. 337 #1 - 4