This math topic focuses on calculating the percentage change in real-life scenarios where amounts are increasing, specifically through the example of calculating tip percentages. The problems present situations in which a person pays more than the indicated price of a meal, and students must determine the percentage increase relative to the original price. This is an introductory level exercise aimed at understanding and applying the concepts of percentage growth in everyday contexts. The topic emphasizes basic problem-solving skills involving percentages, suitable for beginning learners in the topic of percentages.