I created this song and activity to help my students better understand the concept of 1 less, 1 more, 10 less, and 10 more. I love using songs and movement in my classroom! My students LOVE it too and I have already seen this song making a difference in their understanding of more or less! Plus it makes math so much fun!This resource includes:explanation of how to use it in your classrooma link to the youtube video I made of the songsong lyrics poster (in color and black/white)20 more or less ta