Operations and Algebraic Thinking As students deomonstrate understanding, skill, and ability to apply addition and subtraction to all problem situations, the range of numbers with which they work increases to 100. Problem situations include simple tw0-step problems for students to model and explore. Students extend their expertise with mental mathematics strategies initially using concrete materials and later as they continue to practice and become fluent with addition and subtraction facts including all facts through sums of 20.
Numbers and Operations in Base Ten In second grade, students extend place value understanding to working with a new unit comprising 10 tens or a group of 100. Using place value and properties of addition and subtraction, students become fluent with two-digit addition and subtraction including composing and decomposing groups of 10. They extend this work to addition and subtraction to 1,000.
Measurement and Data Second graders begin measuring with inches, feet, centimeters, and meters. In this domain, students learn that the measure of length is a count of how many units are needed to match the length of the object or distance being measured. Second graders will receive numerous experiences estimating and measuring length with a variety of tools including rulers, yardsticks, tape measures, and meter sticks and relate addition and subtraction to their study of length. Students will aslo work with time and money as well as represent and interpret data.
Geometry In second grade, students will be thinking about, describing, and analyzing shapes by investigating their sides and angles. They will also be building, drawing, describing, decomposing, and combining shapes to make other shapes. As a result of the learning, students will develop a foundational understanding for the future concepts of area, volume, congruence, similarity, and symmetry.
The Common Core Mathematics Companion: The Standards Decoded Grades K-2 (2015). Authors: Linda M. Gojack and Ruth Harbin Miles