Do you need a resource for a tier 1 math intervention, a way to assess student's understanding, or looking for a quick way to assess your students mastery of a concept? This resource does that and then some. It's designed to serve as CBM (curriculum based measurements) that will assess a student's understanding of the Numbers and Base Ten Operations (NBT) standards for 3rd grade. You can also use them as a way to enrich second graders or as a way to provide interventions for fourth graders who are struggling with or who lack these fundamental skills. The goal of this resource is to provide you with a way to measure the growth of your students after you provide a targeted tier 1 intervention. There are 4 CBMs for each standard and answer keys are provided too! Progress monitoring graphs are included so that students can graph their own progress and they can be accountable for their learning too.