Over 50 single digit addition and subtraction within 20 worksheets that are aligned to the 1st grade OA Common Core Standards. NO PREP! Just print and go! Perfect for independent work during centers, use during mini lessons, fact fluency practice, assessments, or to send home for extra practice. What's Included:~P.3-8 Add with Number Line ~P.9-14 Count on to Add ~P.15-20 Subtract with Number Line ~P.21-25 Count Back to Subtract ~P.26-37 Addition Fluency ~P.38-49 Subtraction Fluency ~P.50-51