BMX Sums is a fun 2-Player game in which students travel around a race track estimating sums to given addition problems. Each time the students circle the track once, they earn a point. If the score is tied when time expires, the player that traveled further along the track wins the game. An answer key is included to allow for students to self-check. Makes for a great math center. This activity meets or exceeds the Common Core Standards of Mathematics.