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Playlist: Bookmarks

Notice, Wonder: Blood Falls

A mysterious image. Reveal it slowly. Let your students wonder!

Parentheses: How big of a change can they make!?

Two tiny parentheses. One expression. How big of a change can they make? Bigger than you think.

Paradox: The Barber’s Paradox

The barber shaves everybody who doesn’t themselves. So… does the barber shave himself?

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: Palindromic Number Conjecture

Using this one weird trick, it seems that you can turn any number into a palindrome!