Mental Math in abacus is a technique of doing calculations mentally without using any pen, paper, or calculator. After learning abacus, children are able to visualize the abacus instrument in their mind, and use it to perform complex arithmetic operations quickly and accurately.

The mental math techniques learned in abacus classes can help children develop a deeper understanding of mathematical concepts and improve their problem-solving skills. Mental math also helps in enhancing memory and concentration among children.

After completing the abacus course up to a certain level, children are able to do long calculations mentally with astonishing speed. They no longer need to rely on a physical abacus instrument to perform calculations, as they have learned to visualize the instrument in their mind.

Overall, mental math in abacus is a valuable skill that can help children perform calculations quickly and accurately, and also improve their cognitive abilities. It can help them become more confident in math and enhance their overall academic performance.