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Overview of Oregon Common Core State Standards for 2nd Grade
Mathematics  Grade 2
In Grade 2, instructional time should focus on four critical areas: (1) extending understanding of baseten notation; (2) building fluency with addition and subtraction; (3) using standard units of measure; and (4) describing and analyzing shapes.
Critical Area #1
Extending understanding of baseten notation.
Students extend their understanding of the baseten system. This includes ideas of counting in fives, tens, and multiples of hundreds, tens, and ones, as well as number relationships involving these units, including comparing. Students understand multidigit numbers (up to 1000) written in baseten notation, recognizing that the digits in each place represent amounts of thousands, hundreds, tens, or ones (e.g., 853 is 8 hundreds + 5 tens + 3 ones).
Critical Area #2
Building fluency with addition and subtraction.
Students use their understanding of addition to develop fluency with addition and subtraction within 100. They solve problems within 1000 by applying their understanding of models for addition and subtraction, and they develop, discuss, and use efficient, accurate, and generalizable methods to compute sums and differences of whole numbers in baseten notation, using their understanding of place value and the properties of operations. They select and accurately apply methods that are appropriate for the context and the numbers involved to mentally calculate sums and differences for numbers with only tens or only hundreds.
Critical Area #3
Using standard units of measure.
Students recognize the need for standard units of measure (centimeter and inch) and they use rulers and other measurement tools with the understanding that linear measure involves an iteration of units. They recognize that the smaller the unit, the more iterations they need to cover a given length.
Critical Area #4
Describing and analyzing shapes.
Students describe and analyze shapes by examining their sides and angles. Students investigate, describe, and reason about decomposing and combining shapes to make other shapes. Through building, drawing, and analyzing two and threedimensional shapes, students develop a foundation for understanding area, volume, congruence, similarity, and symmetry in later grades. Adopted October 2010 3 OREGON COMMON CORE STATE STANDARDS FOR MATHEMATICS (CCSSM) – GRADE 2
How to read the grade level standards
Standards define what students should understand and be able to do.
Clusters are groups of related standards. Note that standards from different clusters may sometimes be closely related, because mathematics is a connected subject.
Domains are larger groups of related standards. Standards from different domains may sometimes be closely related.
Grade 2 Overview
A. Represent and solve problems involving addition and subtraction.
B. Add and subtract within 20.
C. Work with equal groups of objects to gain foundations for multiplication.
D. Understand place value.
E. Use place value understanding and properties of operations to add and subtract.
F. Measure and estimate lengths in standard units.
G. Relate addition and subtraction to length.
H. Work with time and money.
I. Represent and interpret data.
J. Reason with shapes and their attributes.
The Standards for Mathematical Practice describe varieties of expertise that mathematics educators at all levels should seek to develop in their students.
2.MP.1 Make sense of problems and persevere in solving them.
2.MP.2 Reason abstractly and quantitatively.
2.MP.3 Construct viable arguments and critique the reasoning of others.
2.MP.4 Model with mathematics.
2.MP.5 Use appropriate tools strategically.
2.MP.6 Attend to precision.
2.MP.7 Look for and make use of structure.
2.MP.8 Look for and express regularity in repeated reasoning.
