For teachers of students who struggle with mental math, invert digits when naming numbers, or fail to complete simple mathematical operations, this course addresses early number concepts and the importance of number sense to students’ future mathematical success. Participants in this course will use base-ten blocks, base-ten frames, hundreds charts, a new number system, and their own fingers to represent and manipulate numbers. Teachers will work collaboratively to solve problems that stretch their understanding of place value, taking time to approach problems as learners, communicate mathematical findings, and consider how the content is developed at their grade level. Teachers will increase their content knowledge as they explore how these tools connect to a thorough understanding of place value. To receive 1 CPE credit, participants will attend two 7-hour sessions, participate in discussion board topics, take a pre- and post-test, and complete a final project; the project will be selected by the participants from a list of options including writing and implementing a unit of instruction, analyzing student work and addressing misconceptions, or completing an equivalent and pre-approved project of their own design.