This document discusses the four operations of integers: addition, subtraction, multiplication, and division. It describes four cases of integers operations: 1) starting with positive numbers and adding to make a positive result, 2) starting with positive numbers and subtracting to make a positive result, 3) starting with negative numbers and adding or subtracting to make a more negative result, and 4) starting with negative numbers and subtracting to make a positive result. Examples are provided for each case.