As homeless education coordinator for Billings Public Schools, Sue Runkle frequently gives presentations to help raise awareness about the district’s homeless student population. Even after 18 years in this role, she still occasionally encounters a familiar puzzled look from participants. “Some people will still ask me, ‘Wait — we have homeless students in Billings?’” Five-hundred and three in the 2017-18 school year, to be exact, and 414 so far this year. These numbers can be an eye-opener, Runkle explains, because…