Practice is essential for success in mental calculation—whether it’s for competiting in events, for professional reasons, or simply for personal interest. There are many training apps already available, and a selection that I recommend can be found on this page: mental calculation apps.
However there are several training tools that I know would be helpful but didn’t exist. I’ve therefore built them myself for use with my students! See screenshots for a preview:
Please contact me if you’d like to know more about using these training tools.