Common Core Aligned!!! Rethink Mathematics!!! Allow students to build number sense through play! Constructivist Theory states that knowledge is not passively absorbed, but must be created by the individual. Closest To activity comes in 10, 50, 100 and 0 format! The Closest to 0 activity is a great subtraction addition that can be used with single or double digits. Over time, students will recognize different patterns in number creation and addition. The more you play, the stronger students wil