This 4-page pack has two pages of elapsed time problems using a number line that can be used for independent classroom work, partners, whole group or homework or any other way you'd like! One page has problems specified for "completed together" and "completed with a partner". The last page is designed to be used as an exit ticket/quiz and is marked "completed independently".
In my classroom, I used these problems in conjunction with this excellent student-created YouTube video: Elapsed Time Number-Line: https://www.youtube.com/watch?v=yy0NwS8abQA
and this customizable, printable time matching game: http://www.senteacher.org/worksheet/92/ClockFlashCards.html
After teaching this series of lessons, one of my students commented how helpful this method is for solving elapsed time problems! I hope your students benefit just as much!