It’s getting to the end of our simplifying unit (which extends into other units, later on, hence the shortness). Some kiddos need more practice. Some have already seen this. We do individual practice, which means lots of little papers everywhere. I also miscalculate (many times) and make up to 4 times as many copies as needed. Lots of paper.
Big takeaway from this unit is that area and perimeter are a great way to encourage simplifying expressions in a realesque setting.
Photo: Papers left in class: