Three Digit Addition With Regrouping. Marcos loves ants, and Jose thinks they're a good source of protein. Addition with regrouping is a very systematic concept for students to learn and without a solid understanding of place value, there's no point in Before I start my addition with regrouping unit, I spend a month teaching place value.

The perimeter of a plane (flat) figure is its boundary.
Regrouping is when you add together two numbers in a three-digit addition problem, and your sum is a two-digit answer.
There are also three leveled worksheets for differentiated practice at the end of the lesson. We add the units, tens and hundreds of these numbers separately, starting from. This lesson addresses how place value is used to regroup in addition.