Create an anchor chart with new information: complementary and supplementary angles. I don't believe these terms are in the 4th grade standards, but this lesson allows students to create number sentences equaling 90 and 180. To reinforce the concept after the lesson, students form a straight line. Create a ray in the middle to split the line in two. Give each student a tortilla chip to "supplement" their breakfast. Discuss definition of supplementary angles. Next, students form a 90-degree angle with their bodies. Form a ray from the vertex to split the angle. Then, students simultaneously give teachers compliments. I had a few eye rolls, but it was worth it. Discuss complementary angles. :)
9:00-9:15 Computation Station: Students play Making 10s card game to practice fact fluency. They also create their own addition, subtraction, multiplication, and division problems. After working the problems, they check their work with a calculator.