Here are a collection of resources for teaching students how to write numerals.
A lesson from Illuminations on writing numerals. http://illuminations.nctm.org/Lesson.aspx?id=1620 This lesson goes beyond writing numerals to matching numerals to the correct quantity. I’m disappointed in the numeral cards they provide as a model because they don’t match the way we generally teach children to write numerals. There is a cute song to provide verbal cues for the numeral formation, but the link to the recording isn’t working.
Three YouTube videos with songs about writing numerals –