Common Core Connections: Math is the perfect tool for helping first grade students master Common Core math skills. The Common Core Standards for Math in first grade focus on four main areas: addition and subtraction within 20, developing an understanding of place value, developing an understanding of linear measurements, and composing and decomposing geometric shapes. This resource provides focused practice pages for targeting and reinforcing these and other first grade math skills while helping students connect comprehension with knowledge and application. Connecting the standards to content has never been easier with the Common Core Connections series for Math.