This is a great activity for a Pre-Algebra or Algebra class that's practicing combining like terms! It gives every student the opportunity to participate and not get lost in the crowd. Students are in groups of 4 and it's a relay race to the finish to see which group can combine their series of like terms quickly and correctly! It creates a fun atmosphere for the kids, and as a teacher, you can see individual student work and team work. I've created 3 rounds and the last round includes problems with rational numbers. The answer key is also attached!