This page contains various interactive objects to help visualise various mathematical concepts. Most have been done for the lecture course Introduction to Pure mathematics (but there are also some others). Some are links to other programmes, some are pages embedded in this page.
The following Geogebra Dynamic page shows how one can visualise addition, while this Geogebra Dynamic page shows how one can visualise multiplication.
This Geogebra Dynamic page tries to showcase Bezout's theorem and the Euclidean Algorithm.