If you're looking for a challenge for your students, this is the product for you. Your students are required to show their understanding of the order of operations by providing either a missing number or a missing operation in a series of equations. This can provide a tool for you to evaluate their level of understanding.
An optional reminder display sheet for PEMDAS is included as well as the student answer sheet and key. I've divided the cards into two sets of 24 cards to enable you to use them in a variety of ways.
This is a great tool to provide differentiation for this skill.