• Pedal Power

    Featured Lesson Plan

    May 16 is National Bike to Work Day! Celebrate it using this grades 9–12 lesson plan.  

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  • Deeanna Golden

    In the Community

    Read about how Deeanna Golden came to write lesson plans for Illuminations!

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  • Okta's Rescue

    Featured Game

    Learn to count and subitize by rescuing Okta and his friends. Play on your desktop or mobile device!

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  • Painted Cubes

    Featured Brain Teaser

    A rectangular wooden block (not necessarily a cube) is painted on the outside and then divided into one-unit cubes. It turns out that exactly half of the cubes have paint on them. What were the dimensions of the block before it was painted?

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