seulgiism reviewed Train your brain by Rüdiger Gamm (Heyne -- 60064)
Review of 'Train your brain' on 'Goodreads'
2 stars
It is a good book for beginners to get into brain training: I personally only found the exercises useful since I already have a knowledge in brain training (mnemonics mainly).
I wish the Author would have gone more in depth about mental calculations from a beginner level up to advanced.
Teaching children or adults how to start getting into basic calculations/mathematics up to a high level like Rüdiger himself.