Here's a quick way to assess, and make guided math groups. Put a math problem on the board - a clock face, addition, subtraction, coins, multiplication, whatever - and have the students write the answer on a post-it note, along with their name. Collect them, stick them on a piece of cardstock (I used a sheet protector with cardstock inside), and sort them by struggling students...or by certain mistakes. These were used to determine peer tutors and pair kids up. Quick - easy - guided math groups...done!