Absolutely not the same thing. If necessary or if you are interested, it is recommended to learn fast calculation, but fast calculation is much more difficult than abacus calculation. The reason for this suggestion is that there is no corresponding follow-up or further study in primary school. Therefore, the abacus mental arithmetic learned in kindergarten is basically abandoned. Not only that, children's oral arithmetic in primary school is also influenced by abacus mental arithmetic learned in the past, which leads to slow calculation speed. But quick calculation is different, and it is useful in real life. But if you take abacus mental arithmetic as your own research, it is necessary to study in university.