The fifth grade uses the Illustrative Mathematics problem-based program in which students work collaboratively through a carefully crafted sequence of problems to construct their understanding. Teachers facilitate student learning and push thinking through questioning and discussions to ensure the mathematical takeaways are clear. Students continue to develop number sense and foundational concepts that move them from multiplicative to proportional, and eventually algebraic reasoning. They work to build computational fluency for adding and subtracting fractions, as well as construct their understanding of multiplication and division with fractions. They extend their flexible use of strategies and models for whole number operations to decimals as well. Through various contexts, such as volume and estimation, students will apply learned skills and deepen their understanding of proportional relationships.