This makes a great math center to focus on addition to 20! Students use clothes pins to find the answer to each addition problem! 200 Cards included (4 per page X 50 pages!) A record sheet is included. Students can record the problems they solved. Common Core CCSS.Math.Content.1.OA.C.6 Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. **please rate and comment to receive your TeachShare credits** 1st Grade Salt Life keywords; addition practice, facts to 20, clip cards, math station