My brother and I took lessons from Watanabe Sensei growing up. From a user's perspective, I can vouch for how useful mental calculation is. I still use it every day, and it's really useful in...
Supermath
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SuperMath is an abacus-based mental calculation school founded in 1979 by Mina Watanabe, originally serving just two students in Salinas, CA, and now boasting over 200 students in classrooms across San Francisco, San Mateo, and San Jose. The program emphasizes skill-based learning through the visualization of abacus beads, cultivating both mathematical and life skills like goal setting and focus.
At SuperMath, students engage with numbers in an interactive environment that fosters confidence and quick processing abilities. The school believes in the transformative power of abacus-based education, which not only enhances mental calculation but also equips students with essential life skills that contribute to their overall development.
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Reviews

Our son Milo began abacus ("soroban" in Japanese) classes last year. It's been extremely helpful as a method to build an innate ability for mental math calculation. The staff at this location is...

My daughter has been taking this class every saturday since she was 5. It has been 3 years now and I do not regret the decision. She can do math problems in her head that I would have to write to...