Make Math Moments Academy › Forums › MiniCourse Reflections › The Concept Holding Your Students Back › Lesson 42: Where Comparison Lives In Additive Thinking – Discussion › Reply To: Lesson 42: Where Comparison Lives In Additive Thinking – Discussion

I think my students– struggling middle schoolers– would jump right in to an algorithm. I think adding and subtracting is something they view as a strength of theirs, and where they comfortably live. The problem (like the 1001999 example in the video) is that if students make mistakes in the algorithm, they often don’t recognize that they’ve made mistakes. I think using number lines is a powerful way to help build that number sense– how far apart are these numbers? does your answer make sense?