The author, Yusnier Viera, has several World Records in Mental Calculation and has appeared in prestigious TV channels like CNN & ABC. He starred in the Discovery Channel show "Super Human Lab" in 2012.
Viera is willing to teach all his secrets to calculate mentally.
Buy his book "Basic Course of Mental Arithmetic" available at Create Space and Amazon. Use the code ENGZKYUF and you will save 10% off in Create Space.
- Order at Create Space
- Order at Amazon
- Order here
- PDF Document for just $9.99
- Kindle Edition for just $3.99
If you prefer to watch videos to learn, we strongly recommend to buy our Mental Calculation DVD course.
Please do not hesitate to contact us for more information.