Great for a math workshop station
Response from sumofwhich.com
Thanks Beverly. I am glad your students are enjoying SUM OF WHICH is Twenty. Be sure to try out the other games you can play as well. Directions are on the website. SO YOU THINK YOU CAN ADD is a very popular one. As for score keeping, use base ten blacks. The rod is earned for every SUM of ten and every bonus square and three cubes are earned for each file played. This also helps them to practice composing their tens and even hundreds.
Thanks for sharing.