When my daughter was born she was gifted an abacus by my brother. She loves to play with it because of the colours of the beads and the sound they make. I was

When my daughter was born she was gifted an abacus by my brother. She loves to play with it because of the colours of the beads and the sound they make. I was looking at it at some point and realised that when you use the beads as numbers, rather than counting them, you can go incredibly high. I must have known this earlier in life, but I completely forgot about it. After this I heard a lot about the benefits to learning maths with an abacus versus learning how to do math with a calculator. One of the claimed benefits is that, when you learn maths with an abacus, you get better at doing calculations mentally, whereas if you learn math with a calculator you don't become better at that. Does anyone know of a good resource to learn how to do math with an abacus? I know I can just duckduckgo it, but maybe there is some exceptionally good source somewhere?