These lessons provide hands-on activities and ideas that allow you to lead students in an active exploration of the world of rational numbers. These activities involve students in the exploration of abstract concepts through the use of a number line. These lessons emphasize the Mathematics Process Goals of problem solving, connections, communication and reasoning all using a new representation of a number line which is stressed in the Common Core Standards. Total of 9 lessons that cover most of the units for decimal and fraction number sense, as well as decimal computation. Download the Decimal and Fraction cards to use with these lessons as well as the decimal numberline blackline masters.