Posted on October 5, 2017 by admin Adding 10–19, Practice 1 18 + 12 16 + 12 16 + 19 11 + 14 17 + 15 19 + 16 15 + 14 15 + 10 19 + 18 11 + 13 Post navigationPrevious post: Adding 20, Practice 3Next post: Question #1