Posted on October 5, 2017 by admin Adding 10–19, Practice 4 17 + 13 19 + 11 11 + 14 14 + 19 18 + 18 19 + 14 16 + 18 18 + 11 14 + 13 17 + 19 Post navigationPrevious post: Adding 20, Practice 3Next post: Question #1