A simple abacus app supporting 6 types of abacus (soroban, suanpan, binary, Russian, school & rekenrek) as well as a variable number of rods on each a...
Learn the Abacus and expand your brain power!The Soroban Abacus is a calculating tool in use for over 4,000 years. Abaci are often constructed as a ba...
The building block of education begin the same way for every child in America, learning the 50 states. Give your child the practice they need learn ea...