Our district, Tantasqua/Union 61, began the Houghton Mifflin Harcourt Go Math! program with the 2014-2015 school year. This program is alligned to the Common Core State Standards. All grades, K-6 are using this program. The curriculum materials include differentiated learning centers, hands-on manipulatives, and multiple online interactive practice options. The Think Central website allows you online access to the Go Math! student text and practice book.