Being a total useless bird brain in Maths, I was totally amazed with the way how multiplication is turned into an easy peasy task.
Check this out for yourself:
I've no idea where this method originated from and how long it had been practised. Whatever it is I'm still truly amazed by how this complexity can be turned into simplicity without the help of any calculation tool.
If you have any extra information about this, I would certainly appreciate them.
I will certainly introduce this to my little heroes when they are ready for this;)