This fourth grade addition and subtraction unit guide includes 10 lessons that teach common core (CCSS) 4th grade addition and subtraction standards using multiple strategies with up to 6 digit numbers. It includes 10 lesson plans, 5 practice worksheets, a study guide, a whole group subtraction activity, and a unit test (plus all answer keys). Skills taught include: adding and subtracting with base ten blocks (builds conceptual understanding of regrouping) addition and subtraction using an open