Adobe Reader has some great features - such as inserting a signature or filling in forms. However, when sharing out completed forms or PDFs with annotations, the notes do not appear. It seems as though this is best used if annotating and then printing.
"Mathtoons Media creates high level math learning tools that use wacky animation, humour and music. The Mathtoons Log App helps students learn how to change between exponential and logarithmic forms of an equation with the animated guidance of Captain Calculator and his assistant, Corporal MiniCalc."