Give a seven-year-old six rods of ten and three loose cubes, then hand over five more cubes, and watch where the new cubes go. Most children slide them next to the loose ones without thinking, and that instinct is the heart of place value. This 2nd grade rods and cubes addition worksheet draws the same scene six times. Each box shows a two-digit number in rods and cubes, with a one-digit number in cubes beside it: 63 + 5, 47 + 2, 22 + 1, 11 + 5 and two more. Your child reads the model, adds, and writes the sum on the line. A second page gives the answer key.