Mr. Billings is preparing lesson plans for his sixth-grade math class on the topics of the area and perimeter of basic shapes. He decides that he would rather expose the students to real-life scenarios that require the ability to calculate area and perimeter rather than simply teaching them the concepts. He designs a series of lessons wherein the students will create a floor plan and decoration budget for their perfect bedroom. As part of the assignment, they will calculate the amount of wallpaper and carpet they will need as well as how much rope lighting will be needed to go entirely around the room. He will grade their work products using a teacher-made rubric. Which instructional learning approach is Mr. Billings using to teach the concepts of area and perimeter?