Calculationnation.nctm.org - Live Online Math Contest

Games include:

- Square off: Learn about area and perimeter to capture spaceships.

- Factor Dazzle: Use your number sense to find factors.

- Fraction Feud: Make a fraction that is greater than (or less) than the opponent's fraction.

- Times square: Try to get four-in-a-row using your multiplication skillls.

- Slam Ball: Play a game using angels and symmetry.


Each game can be played either againt opponents or against yourself. Your scorecard keeps track of your total number of victories across all games.

Calculation Nation was created by the National Council of Teachers of Mathematics.

The NCTM Illuminations project is also well worth a visit. It hosts a number of math games, activities and lessons for all grade levels.

From the website:
The National Council of Teachers of Mathematics is a public voice of mathematics education, providing vision, leadership, and professional development to support teachers in ensuring mathematics learning of the highest quality for all students. With 100,000 members and 250 affiliates, NCTM is the world’s largest organization dedicated to improving math education in preK‑12.