This video demonstrates how to use addition and subtraction with decimals to solve real-world problems. The video presents two different scenarios, one where a person needs to determine if they achieved their goal of biking three miles, and another where two brothers need to figure out what food and drinks they can purchase at a movie theater with a $20 budget. Throughout the video, the importance of lining up decimals according to place value is emphasized, and the concepts are demonstrated through graphical representations and mathematical expressions.