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Which is better for preschool children to learn abacus mental arithmetic or hand-brain quick calculation?
This is also a problem, it must be the latter.

I learned this before when I didn't have a quick hand-brain calculation, but who will learn abacus mental arithmetic with a quick hand-brain calculation? I was in Zhengzhou, and my children learned Yi Dao's hand-brain quick calculation in the Children's Palace. It changed a lot, not only because of quick calculation problems, but also because of strong reaction ability. I like it very much!