A continuation of Number and Operations for Elementary School Educators extending the ideas developed for whole numbers and integers to the rational numbers (represented as fractions and decimals) and the behavior of units under the four basic operations. Mathematical content also includes ratio and proportion as well as basic concepts of number theory. The mathematical content is integrated with the approach to mathematics teaching and learning found in the National Council of Teachers of Mathematics' Principles and Standards of School Mathematics and the Maryland State Standards. Common misconceptions related to this material and how to address these misconceptions are integral to the course. [ 3 credits ]