The Common Core Standards don’t give equal emphasis to every topic within a grade level. Instead, some concepts require more focus due to their depth, the time needed to master them, their importance for future math learning, or their relevance to college and career readiness. Students need to dedicate more time to these areas to meet the Mathematical Practice Standards. In Grade 1, teaching should concentrate mainly on these four key areas: (1) developing strategies for addition and subtraction within 20; (2) understanding place value and the relationships between whole numbers, including grouping by tens and ones; (3) developing skills in linear measurement and using length units to measure; and (4) reasoning about the properties of geometric shapes and how they can be composed and decomposed. This worksheet provides plenty of practice on these topics through brief and straightforward activities for your classes. We hope you enjoy them with your students!