Do your students need to practice Addition and Subtraction within 10? Help your students master basic addition and subtraction.This is a set of 90 practice sheets and 800 problems for Kindergarten and 1st grade. Use this for homework, summer school reinforcement, as a teaching aid, or as an in-class assessment for students.They are both mixed (addition and subtraction) and separated (just addition, just subtraction).Answer keys are included.This pack includes standards/concepts, basic addition,