Learn to count with abacus/sempoa
(Basic) 1 marked with (.)
(Basic) 2 marked with (..)
(Basic) 3 marked with (...)
(Basic) 4 marked with (....)
(Basic) 5 marked with (_)
(Basic) 6 marked with (._)
(Basic) 7 marked with (.._)
(Basic) 8 marked with (..._)
(Basic) 9 marked with (...._)
(Basic) 10 marked with (__)
(Basic) 0 marked with ()
(Basic) 15 marked with (___)
(Basic) 30 marked with (__=)
(Basic) 40 marked with (==)
(Basic) 50 marked with (__==)