Utilize these addition and subtraction task cards in math centers, for early finishers, or differentiate for various skill levels. Student recording sheets, answer keys, and assessments are also included. I chose to use different borders as the skills progress in difficulty. In my classroom, I laminate the cards, group them by skill, and put them on a ring, so that I can easily choose just the right ones for each group of students. Each card is numbered and includes the Common Core standard, for easy reference.