Response from sumofwhich.com
Joy, I am so pleased to hear that your son is enjoying SUM OF WHICH. The strategy element in the game keeps children engaged and wanting to play again and again. Be sure to check out the expansion tile sets as your child gets older so he can continue to be challenged as he plays. Having fun while practicing his facts will increase his fluency.
Thanks for the review and let me know if you have any questions. Also, remember to check out the directions for the sister games on the website. Children really enjoy playing those as well and you have everything you need with the materials from SUM OF WHICH.