When I was in my semester of student teaching, I had the opportunity to teach my sweet little class of 2nd graders addition with regrouping. One of the first things that I learned about second graders is that if you tell them a “method” of doing something (i.e., carrying the ten in an addition and regrouping problem), they are going to do that on EVERY PROBLEM unless you teach them how to tell whether or not they’re supposed to regroup.
Being a newbie, I tried explaining it to them in (what seemed) like a million different ways. Some of the students got it quickly… but others… just stared at me like I had 8 heads.
After giving them visuals and using base 10 blocks and filling in 10 frames and ALL THE METHODS (that were graciously given to me by my fantastic mentor teacher)… I felt like they finally grasped the concept of WHY an addition problem may or may not regroup.
SO, I created a sorting folder activity for my students to do. This product was designed for a unit on addition and subtraction with regrouping. I used this to introduce to the students HOW to identify a problem that regroups and a problem that does not.
We first talked about why an addition problem (or subtraction problem) would need to be regrouped. Then, I had the students look at each problem and either write “D” for “Don’t Regroup” or “R” for “Regroup” in the gray boxes on the worksheet.
A few weeks later, once the students had more practice with addition (or subtraction) with regrouping, we revisited this activity. I had the students take their squares out of each bag, solve the problem, and determine if they had sorted it correctly or not.
Head on over to my TPT shop to grab this activity for your students! It works well for 2nd and 3rd graders as a teaching tool and upper grades as an RTI tool.