Response from sumofwhich.com
Kara, I am so happy to hear you are using SUM OF WHICH for small group intervention. What a great way to get students engaged in their learning. As you mentioned, the game will grow with them. You can play SUM OF WHICH is TEN, TWENY, 100, 1 (with fractions), and you can even play SUM OF WHICH Integers.
Don't forget to check out the sister games that can be played with the materials included with SUM OF WHICH. SO YOU THINK YOU CAN ADD and the other games (all directions are on the website) are wonderful fluency games.