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When two plus two does not equal four

Just 2 percent of teachers in two countries (China and Japan) said their students are four months behind schedule. In our survey, many more Canadian, UK, and US teachers said that their students were lagging by four months.

Teachers reported that students were on average two months behind where they usually would have been by early November 2020.
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To read the article, see “Teacher survey: Learning loss is global—and significant,” March 1, 2021.