scientific notation practice pages http://www.math-aids.com/cgi/pdf_viewer_9.cgi?script_name=scientific_notation.pl&exponent=2&zeroexp=1&language=0&memo=&answer=1&x=103&y=40
scientific notation Khan video https://www.youtube.com/watch?v=kSx873lOgIc
scientific notation Khan video https://www.youtube.com/watch?v=kSx873lOgIc