This catchy song and PPT presentation is the way that I teach my first grade students their doubles addition facts through 20. Once the students learn the song, we can sing it while waiting in line, during transition time, or for a quick brain break. The PPT includes the audio recording of the song so that you can get the tune down, but do not feel like you have to play the audio, as I do not have the most charming singing voice. :-)
When you are finished with the song, use the extra slides to quiz the students on their facts. When singing the song orally, throw doubles facts at students randomly to quiz the students on their fact fluency.