Second graders become experts in addition and subtraction, being able to quickly and accurately add and subtract one- and two-digit numbers with sums up to 100. They're also expected to memorize all the sums of adding two one-digit numbers. For example: 5 + 4 = 9 and 8 + 9 = 17.
Second Grade Math Objectives. In second grade, students continue with more sophisticated approaches to addition and subtraction and begin understanding the patterns leading to multiplication. Simple fractions are also introduced this year. Geometric learning extends a student's understanding of shapes and their parts.