May 16 is National Bike to Work Day! Celebrate it using this grades 9–12 lesson plan.
Read about how Deeanna Golden came to write lesson plans for Illuminations!
Learn to count and subitize by rescuing Okta and his friends. Play on your desktop or mobile device!
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?
Play online math strategy games against players from around the world.
Challenge students and mathematics enthusiasts with these puzzles.
Read and share experiences of how people have used Illuminations’ resources.
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