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Playlist: Bookmarks

Rounding Numbers (But Not To 10)

What could we possibly do to make rounding more interesting for students who already get it? In this series, students consider how they might round to values other than “the nearest 10.” How, for example, do we round to the nearest 9? 7? 15?

Math Curiosity: Four Squares

Every positive integer can be written as the sum of (at most) four perfect squares!