Domino Addition, 1st Grade

Here I go, blurring the lines between work and play.  Facebook, my source of connecting with family and life-long friends is also providing some great resources for Math.  I "liked" Illustrative Mathematics and wouldn't you know it, I get math tasks that pop up where I least expect them.  They're nestled between statuses on the most recent episode of The Bachelor and updates on potty training progress of little ones.  This is the latest for 1st grade, Domino Addition.