Thanks for taking the time to give me such thorough advice, much appreciated. Think I'll sit down and try to fix this when I have time. Yes I am new to authoring Kata (and to Javascript) so I'll take my time to research exactly what the floating point error is and understand how your solution fixes my kata before I dive in and change the code. Would I be able to create a duplicate of the kata to test that I have amended it correctly before 'breaking' this original one? Thanks for this, I had no idea this was the case and will change it once I understand fully.

I'm a newbie so sorry if I've wasted your time but I can't define the "language" (Javascript) in the dropdown menu. Just keeps unselecting and then telling me "undefined language not supported" when I attempt a test.