This centers-based lesson plan on problem solving with addition is designed for two-days of 45-minute lessons or one-day of a 90-minute lesson block. The lesson provides differentiated instruction using the H.O.P. Centers Framework. H.O.P. stands for Hands-On, Open-Ended, and Practice which are the themes for each of the three centers in the framework. Lesson structure is designed using brain research principles. In this lesson students will learn how to solve problems using addition with a short engaging lesson, hands-on activity, practice writing about a word problem using addition, and engage in tiered practice of the concept.