In the following technical report, we present evidence of the technical adequacy of the easyCBM[R] math measures in grades K-2. In addition to reliability information, we present criterion-related validity evidence, both concurrent and predictive, and construct validity evidence. The results represent data gathered throughout the 2009/2010 school year in school districts in the Pacific Northwest. (Contains 159 tables and 1 footnote.) [Support for this work was provided by the Center on Teaching and Learning (CTL).]