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Playlist: Math

Broken Calculator: 2-Digit Subtraction

This calculator gets subtraction wrong the same way every time. Can your students crack its broken rule?

What’s In My Brain: Trapezoids or Not?

Which are trapezoids and which are not?

Game: Order and Chaos

Imagine Tic-Tac-Toe if both players could play as both Xs and Os!

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?