These cards make use of a self assessment strategy called glass, bug, mud from a popular education article written by Kimberly Grimes and Dannelle Stevens found at the link below.(http://2011ed5840.wikispaces.com/file/view/Glass+Bug+Mud.pdf)
These cards in particular address the 4th grade Common Core Standard for patterns.
(CCSS.4.OA.C.5 Generate a number or shape pattern that follows a given rule. Identify apparent features of the pattern that were not explicit in the rule itself.)
This is a great way to incorporate self assessment and differentiate practice in the classroom.