Mrs. Hersey gave us a challenge to use our new math skills for figuring out elapsed time.  We worked with a partner to create a museum schedule of open hours.  Sounds easy, right?  Not!  There were specific parts to the challenge to consider such as:  the woman in charge could only work six hours a day for five days, preschool children could only go to the museum in the mornings, school-age children get out of school at 2:50, working parents can only go on weekends, etc.  We had to create a schedule that would have the museum open a fair amount of hours for each of those groups of people.  It took several days to find a solution to this challenge.  Then we created a sign for the museum door.  It was really interesting to see the seven, very different, solutions to this challenge.