You sing this to the tune of B-I-N-G-O. There is also an adorable estimation jar book that I forgot to take a picture of... I really wish I could share the copy with you. But it essentially is a cover shaped like a jar and identical pages where the students record their estimation, the actual number and a drawing. I have taught my students to draw small circles (easy for everyone to draw) in groups of ten that they circle. Then they draw the ones without circling them. I am forever impressed by my student's!!