asked Marina Ratner, a professor emerita of mathematics at ... how to graphically model what it means.” For the sake of space, I’ll show the number line and common denominator models here.

Addition & subtraction strategies to solve two-digit equations using an open number line. In this lesson, students go over using different addition and subtraction strategies to solve two-digit ...

So, how might teachers do this? Provide opportunities for students to model math facts with counters, number lines, and area grids. Pose investigations to explore the patterns in math facts.

And let’s be honest, the way we’ve been teaching math for generations in America ... And yet, the parent’s humor aside, the point of the number line model is not to teach the most efficient ...