Today marks National Pi Day in the United States and around the world. The holiday commemorates a timeless symbol beloved by ... inviting kids to throw pies made of shaving cream at one another ...

Kids will search for digits of Pi, spot math symbols, and sharpen their observation skills—all while having fun. Whether for a quick brain break, a math center, or a hands-on lesson, this ...

The value of the Pi was first calculated by Archimedes. The Pi symbol was introduced by William Jones, a Welsh mathematician, in 1706. In 1737, Leonhard Euler popularised the usage of the symbol.