Grade 9 Big Ideas: Math The principles and processes underlying operations with numbers apply equally to algebraic situations and can be described and analyzed. Computational fluency and flexibility with numbers extend to operations with rational numbers. Continuous linear relationships can be identified and represented in many connected ways to identify regularities and make generalizations. Similar shapes have proportional relationships that can be described, measured, and compared. Analyzing the validity, reliability, and representation of data enables us to compare and interpret.