How is it possible to win the popular vote, but lose an electoral college election?

Fourth grade students watched the video below and modeled the mathematics to find out the answer to this question.

 Here is the problem they worked on:

Here are some of their solutions:

Here are some thoughts they had about the election results:

Next math question:

How many ways could colored pencils win this electoral vote?

How can you be sure you’ve found all of the ways?