MUMBAI -- India, widely considered the birthplace of the number zero, has a proud mathematics tradition. So it came as a shock to Byju Raveendran when he learned that many middle school students were unable to do basic arithmetic.
Eleventh-grade student Akshath Mugad uses the Byju's learning app at home in Mumbai. The app has 2 million paid subscribers. (Photo by Kosaku Mimura)
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