Twin Sisters has produced both individual songs and albums with songs to help children master their facts for addition, subtraction, multiplication, and division. The songs are all set to rap music that is light, cheery, and clearly enunciated. Multiplication facts are sung through the twelves, addition through sums of eighteen, and subtraction to eighteen. There are three songs that teach the concept of division and songs that teach the facts through quotients and divisors of 9.
Songs are downloaded as MP3 files.