these books, it's easy for me to train the teachers on how
to use the abacus in schools. These books were well-written.
A lot of thought has been put into content development by
looking at how the content flows flawlessly to suit the needs
of pupils in their math classes."
Abacus Trainer, MALAYSIA
parents can help their kids learn mental arithmetic since
the books have been written in the simplest way that everyone
understands. Teaching the abacus is made so much easier with
Abacus & Mental Arithmetic Instructor,