A former elementary teacher, Dinah Chancellor has been involved in teaching children to use reasoning and creativity to solve problems for most of her professional life. Ms. Chancellor has served as a reviewer for the NCTM elementary journal, Teaching Children Mathematics, developed the Calendar Math column, and served as its author/editor for the fi rst three years. She has been Treasurer, Membership Chair, and President of the Texas Association of Supervisors of Mathematics and has chaired the Board of Directors for the Conference for the Advancement of Mathematics Teaching in Texas (CAMT). Ms. Chancellor is an author of Scott Foresman - Addison Wesley Mathematics ©2008 and Scott Foresman - Addison Wesley enVisionMATH ©2009.