Rational Number Project The Rational Number Project (RNP) advocates teaching fractions using a model that emphasizes multiple representations and connections among different representations. Important products from this latest work include (a) a companion module of 28 lessons related to fraction operations, decimal concepts, order, equivalence and operations with decimals (addition/subtraction); (b) deeper understanding of students’ understandings and misunderstandings as they develop meaning and procedural skill with fraction operations and initial decimal ideas.