Look closely to see if you can find D.C.'s error in his addition.

Join Mrs. Gray for a Mystery Math Mistake. Dotson needs your help with making sure all of his ten frames are less than his focus number.

Warm up with a Mystery Math Mistake to tell whether Dotson's 10-frames represent a number less than his focus number. Tell Which One Doesn't Belong by examining four sets of pattern blocks. Use pattern blocks to make different shapes.