If your students need to practice addition and subtraction facts, here are 21 worksheets with answer keys. These practice sheets are great for homework, independent work, morning work, or seat work. Zoo animal clip art added to each page for students who enjoy a little coloring. Includes addition only, subtraction only, and mixed worksheets with both addition and subtraction. Designed for kindergarten, 1st grade, or 2nd grade.1. Sums to 10 – 3 worksheets2. Sums 11 to 20 – 3 worksheets3. Sums to