We usually learn how to count at English at school, and then we forget about it. Until the day when we have to use English for work and we find that saying numbers is not always easy.
So here's a little video for you sing along to. Close the curtains and sing it alone, or find some children to sing with you. It even has an exercise routine that goes with it - exercise and English at the same time, great!
(PS If you want some other great songs to help your children learn English, have a look at DreamEnglish.com.)