Animated blocks of duodecimal come together to teach the four basic operations of arithmetic to 7+ People using songs, games and puzzles. Level 1 1 2 3 4 5 6 7 8 9 X Level 2 El 10 11 12 13 14 Level 3 20 30 40 50 60 X0 El0 100 Level 4 31 3El Original by Arifmetix
Six Redesigned
