Third-grade teacher Andy Gomez stood at a whiteboard before 10 of his colleagues on a recent Thursday afternoon at Marie Reed Elementary in Adams Morgan. His students were stumbling over subtraction problems like 700 minus 369, he said — the zeros were tripping them up.
The solution to their difficulties was coming — by way of Japan.
For the next half-hour, the group discussed — down to nitty-gritty details about vocabulary to use or avoid — what the students’ fundamental misunderstandings about numbers might be and how to address them.
This collaborative examination of the mechanics of teaching is part of the school’s embrace of “lesson study,” a model of professional development for teachers that was developed in Japan. It was pioneered in the District by five teachers at Marie Reed, who began meeting weekly two years ago to study math content and pedagogy.