This game is designed to strengthen student's mental math skills. With a partner, students pick a starting number between 200-600. Then, using the game sheet and a paper clip, a child spins the spinner to see if they will add 10 or 100 to their number. Once the number is mentally added and recorded, the other player goes next. Play continues until the boxes are filled. It's a fun way for students to practice adding mentally and it covers a 2nd grade Common Core standard!