Third Grade Addition 4 - Adding 3 Digits with Regrouping in the Ten's and One's Place teaches 3 digit number addition with regrouping in the the one's and ten's place. Conceptual understand is modeled using the take apart strategy, and modeling with base ten blocks. In addition, there is a 20 question digital Easel Assessment that checks the student understanding of this lesson. It is self-checking for the student and auto-graded for the teacher. This is perfect for distance learning