Morning has broken in the 4th-grade, class 6 classroom at Yongin Seonong Elementary School. Students gather in small groups. As the 4th graders arrive, the first thing they place on their desks are ...
"This," says Matthew Carpenter, "is my favorite exercise." I peer over his shoulder at his laptop screen to see the math problem the fifth grader is pondering. It's an inverse trigonometric function: ...
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