exponential function, in mathematics, a relation of the form y = a^x, with the independent variable x ranging over the entire real number line as the exponent of a positive number a. Probably the most important of the exponential functions is y = e^x, sometimes written y = exp (x), in which e (2.7182818…)

The original xtramath guy had a special place in everyone's hearts. But unfortunately, he has been replaced by an animated version. This new animated version has less of the joy and liveliness of the original. It is estimated that 6.5 Million students use XtraMath annually.

An operation is complete when the student has demonstrated fluency in all the individual facts within the operation. When this is the case, the fluency matrix on their student report will be completely green, and the score will be 100. Fluency score: 100 (done with the operation!)

Reportedly, his real name is Christopher Robert. He is a National Board Certified Teacher in the Seattle school district and was once honored as "a hero in the classroom" in 2009. However, not much is known about Mr. C outside of that.