Grade 2 Big Ideas: Math Numbers to 100 represent quantities that can be decomposed into 10s and 1s. Development of computational fluency in addition and subtraction with numbers to 100 requires an understanding of place value. The regular change in increasing patterns can be identified and used to make generalizations. Objects and shapes have attributes that can be described, measured, and compared. Concrete items can be represented, compared, and interpreted pictorially in graphs.