Between 2700 and 2300 BC, Sumerian and ancient Mesopotamians invented the abacus. The abacus is a straightforward tool for computation. It consists of a frame with rows of wires or thin rods along which beads are moved. Today, with its concept of mental math, the abacus has become an excellent tool for improving a child’s brain processing speed working memory and long-term memory. This can help children learn faster than if they were reading or listening. It enhances the brain’s processing speed to quickly and efficiently process information.

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https://ucmas.ca/abacus-learning-affects-a-childs-brain-development-as-well-as-overall-development