I got this CD along with subtraction and multiplication and have been slightly dissappointed. My 7 year old said they sounded like baby songs. I still played them and they did help him. My 9 year old likes the multiplication cd. The songs dont' sound so young. I was dissappointed that they came in a paper case. I think for $10 they would come in a plastic case. I have to keep them in my purse so they wont' get scratched.