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.

Points, line segments, lines, rays and more.. and a fun game to play at home Points, line segments, lines, rays and more.. and a fun game to play at home ...