Recent studies have documented positive effects for early intervention in improving the mathematics performance of low-achieving children. Consequently, educators need technically sound mathematics screening measures to identify children at risk and then intervene to improve achievement. In this article, we describe preliminary technical adequacy evidence for four early numeracy measures (number identification, quantity discrimination, quantity array, and missing number). We assessed over 300 kindergarten and first-grade students in two states to evaluate the reliability and criterion validity of the four measures. Fall and spring administrations of the measures for one subgroup provided preliminary evidence of students' growth on the measures over time. The results supported three of the four measures as potential tools for screening in the early grades.