The study has clarified the role of inequality in developing of students' thinking, especially creative thinking. This research focused on developing students' creative thinking by creating new inequalities like: finding a generalization of inequalities, changing in a familiar equation, using similar methods of a proved inequality to create new inequalities, creating new inequalities from old inequalities. Creating new inequalities helps students to become more familiar with, investigating, exploring, and discovering the nature of the problem and to use different strategies in solving Mathematical problems.