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.

Join Mrs. Ignagni for a Mystery Math Mistake with her friend Springling. Can you figure out where she went wrong on her open number line?

Warm up with a Mystery Math Mistake to find the error in DC's addition. Use different strategies to subtract including counting back and the connection between addition and subtraction. Use a number line to help count on to find a difference.