For Rachel Warach’s class, the 133rd morning of first grade, numbered on a poster board behind her, was similar to all of the previous mornings.

Her students from across Chicago spent 15 minutes working quietly on math problems and writing in their journals. They split into small reading groups, with Ms. Warach bouncing between them to offer feedback. Later, there was an Earth Day discussion of “The Lorax” and a math lesson on sorting everyday objects — rolls of tape, coins, pens — according to shape.

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