Here are two combinations of numbers sorts. Use a pink or red 12 x 18 piece of construction paper and fold it in to fourths. Students will glue the headings in to each box of construction paper. Students will then color the hearts, figure out the sum of each combination, and glue under the correct heading. Students can use mental math, fingers or manipulatives if needed. This can be used as morning work, a math center, or independent work.