The integration tool integrates and graphs functions that student enter into the tool. The tool uses the trapezoidal rule, Riemann sums, and Simpson rule to integrate the function.

College professor Dan Bach offers a review of the calculus concepts of integrals and vectors. Examples and animated graphs are provided.

This activity allows the user to visually explore the idea of integration through approximating the integral value with partitions. The user controls the number of partitions, the upper and lower limits, and the method used to estimate...

University of Tennessee provides this tutorial site explaining summations and how to evaluate them on a TI(85-86) calculator.