Within a response to intervention system of teaching and learning, important instructional decision-making (e.g., implementation of targeted intervention) is regularly tied to the results of formative assessments administered to students throughout the academic year. The validity of these instructional decisions depends to an extent on the alignment between formative measures and the content standards on which classroom instruction is based. Specifically, formative assessments must be aligned to adopted content standards in order for teachers to make valid instructional decisions around individual student learning needs. In this technical report, we report on the alignment between easyCBM® grades 6-8 seasonal mathematics benchmark items and the Common Core State Standards (CCSS). Results suggest reasonable alignment to the standards overall, with areas of relatively stronger and weaker alignment across grade level domains and standards. These results serve as the basis for assessment development plan in school year 2012-2013 to address gaps in alignment between easyCBM® and the CCSS. The following are appended: (1) Participants; (2) Alignment by Item; and (3) Alignment by Standard.