KENTWOOD, MI -- In Beth Ledesma's second-grade classroom, students are looking at bar models to help them grasp basic mathematical principles, seemingly a simple idea but one that is emerging across ...

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Bar modelling is not a method of calculation. It provides a diagram to help understand what working out should be done to solve a problem. Bar modelling is used to help understand how to solve ...

Editor’s note: Bill Jackson was a Paterson, New Jersey math teacher and a district-wide math teacher trainer in Scarsdale, New York. He also provides consulting and teacher training on Singapore or ...