Updated missing url https://rawgit.com/ScriptEdcurriculum/curriculum/master/units/5-javascript/lessons/4-project/starter_code/js/calculator.js to https://cdn.jsdelivr.net/gh/scriptedcurriculum/curriculum/units/5-javascript/lessons/4-project/starter_code/js/calculator.js
https://code.jquery.com/jquery-1.9.1.min.js
https://rawgit.com/ScriptEdcurriculum/curriculum/master/units/5-javascript/lessons/4-project/starter_code/js/calculator.js