Today, millions of teachers search online to locate ideas and activities for classroom use. While some may visit established curricular sites with vetted classroom materials, many others turn to online educational marketplaces such as TeachersPayTeachers. However, issues of quality on these sites remain in question -- particularly when it comes to…

Teachers of mathematics recognize the difficulty of reaching every student when the range of student abilities puts a considerable strain on the classroom discussion and time. In a response to the problem, students are grouped so that those with greater mathematical aptitude help those who have difficulties. While this approach is to be…