If your students are anything like mine, they are struggling to remember the order of operations. Especially parentheses, brackets and braces (oh my!) Or they forget to multiply/divide or add/subtract from left to right (which ever comes first). These are perfect for them. I like to laminate them and have them put it in their strategy folder. You could print these out and staple them into their notebook if you want. However you want to use them, but these are a must for students learning the order of operations.
Print them in color or black and white. Either way they are sure to be a big help for your students.