Math students have a love-hate relationship with the funky, expensive TI-84 graphing calculators, but thanks to a new deal, they'll soon get a free option. Starting this spring, pupils in 14 US states ...

“It’s hard to believe, but my students were among the first in the world to do it,” gushes middle school math teacher Cathy Yenca. “And after two test runs prior to testing day, there really weren’t ...

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