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Head-scratching grade school math sum divides people... can you remember the golden rule?

A grade-school math problem has stumped people. Can you solve the equation?
The Hechinger ReportOpinion

TEACHER VOICE: A districtwide curriculum and group instruction helped turn around middle school math scores in my high-needs district

In a Massachusetts school district, by 2021, after years of decline on the state test, only 12 percent of middle schoolers ...