This activity practices 2 important math skills--subtracting 2-digit numbers and determining if a number is even or odd. For this worksheet, students solve each subtraction problem and use the difference to sort into the even or odd category. The first sheet has 2-digit numbers with no regrouping, and the 2nd sheet has many problems in which regrouping is involved. Students can show their work in the rectangle or in their math journal. Check out my addition even/odd sorting sheets just like this!