Subtraction with regrouping - such a difficult concept for students to learn. When I first started student teaching my students were reviewing this skill. Recently, it became obvious that we needed to review again. Either they regrouped on every single subtraction problem or they didn't regroup on a single subtraction problem.
I had introduced a subtraction poem when I first started student teaching, but never was able to teach the students what it actually meant. Once we started reviewing subtraction again, we took the time to learn what each part meant.
Together, we did a subtraction sort. We compared the numbers in the ones place to determine which category the problem went in.
After we did the sort together, I had the students complete a different subtraction sort on their own. Once they had the problems in the correct category, they solved them. This helped them know when they needed to regroup and when they could subtract as normal.
Once the students had a better understanding of when to regroup, we played subtraction bingo! I don't think I have ever seen my students work as quietly and diligently as they did this day. This game was great because it provided the students with a lot of practice, but they also loved playing bingo after.




