3-1 Multiplying and Dividing Integers
3-1 ANS KEY

3-2 Adding Integers
3-2 ANS KEY

3-3 Subtracting Integers
3-3 ANS KEY

3-4A Lumps and Bumps Method
3-4A ANS KEY

3-4 Review of Operations with Integers Mod Bies Group
3-4 Review of Operations with Integers Roberts Group 
3-4 ANS KEY