Here is great practice for your second graders for adding and subtracting without regrouping. These are good for the beginning of the year, differentiation, homework, and math centers. Aligned with CCSS.MATH.CONTENT.2.NBT.B.5, the four sets of 24 (96 in all) will help your students build fluency in this basic and important skill. Student worksheets and answer keys are included.
You can find a complete listing and selection of many second grade math materials at the following link
Math Grades 2-3