For nearly an hour, no one speaks a word of English in this first-grade math class. Not the teacher, Ying Ying Wu, who talks energetically in Mandarin’s songlike tones. Not the students — 6- and ...
The Duolingo math app will cover basic third and fourth grade level mathematics, including multiplication, division, fractions, angles, and area measurements. A Duolingo language lesson looks more ...
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