Grade 7 Big Ideas: Math Decimals, fractions, and percents are used to represent and describe parts and wholes of numbers. Computational fluency and flexibility with numbers extend to operations with Linear relations can be represented in many connected ways to identify regularities and make generalizations. The constant ratio between the circumference and diameter of circles can be used to describe, measure, and compare spatial relationships. Data from circle graphs can be used to illustrate proportion and to compare and interpret.