NCDPI Mathematics Unpacking Document Revisions

Second Grade

The Unpacking Documents are designed to help North Carolina educators teach the Common Core State Standards (Standard Course of Study). NCDPI staff are continually updating and improving these tools to be helpful and specific. We believe that as this document is used, teachers and educators will find ways in which the unpacking can be improved and made ever more useful. Please send feedback to us at and we will use your input to refine our unpacking of the standards. Thank You!

Date / Page # / Domain/Cluster / Revised Content
July 2013 / 5, 10 / Operations & Algebraic Thinking / Added vocabulary:
Represent and solve problems involving addition and subtraction.
comparing, unknown
Work with equal groups of objects to gain foundations for multiplication.
equation, sum
23, 25 / Measurement & Data / Measure and estimate lengths in standard units.
measure, standard units, metric, tools, sums, differences
Relate addition and subtraction to length.
addition, subtraction, unknown, sums, differences, measure, standards units, customary, metric, units, sums, differences
June 2013 / Removed the At a Glance Page (page 2) transitional document
24 / Measurement and Data
2.MD.2 / Changed:
Example: A student measured the length of a desk in both feet and inches. She found that the desk was 3 feet long. She also found out that it was 36 inches long.
33 / Geometry
2.G.2 / Added:
This standard is a precursor to learning about the area of a rectangle and using arrays for multiplication.
33 / Geometry
2.G.3 / Added:
It is important for students to see circles and rectangles partitioned in multiple ways so they learn to recognize that equal shares can be different shapes within the same whole.
Glossary / Changed: Addend Unknown to 1st Grade
Changed: Both Addends Unknown to Kindergarten

August 2012 / 6 / Operations and Algebraic Thinking / Addition of the wordaddend to the mathematical language.
6 / Operations and Algebraic Thinking / 2.OA.1Clarification of one-step and two-step problem types, including use of single-digit numbers for two-step problems.
11 / Operations and Algebraic Thinking / Addition of the word addend to the mathematical language.
11 / Operations and Algebraic Thinking / 2.OA.3Explanation added to help build the conceptual understanding of even and odd.
14 / Number & Operations in Base Ten / 2.NBT.1Example changed from 716 to 726 to better illustrate mastery and non-mastery.
17 / Number & Operations in Base Ten / 2.NBT.5 Additional clarification added regarding algorithm expectations for third and fourth grades.
33 / Geometry / Added the vocabulary word “feature” with an explanation from the CCSS Writing Team. Geometry figures from previous grades are also noted.
33 / Geometry / 2.G.1 Provided a teacher note on regarding the definition of trapezoid.
34 / Geometry / 2.G.3 Additional explanation provided for equal partitioning.
36 / Table 1 Glossary / Correction made to table regarding Smaller Unknown-Compare: First Grade = Fewer; Second Grade = More
Identification of one-and-two step problems for 2nd grade as informed by Progressions for the Common Core State Standards in Mathematics.
February 2012 / 9-10 / Operations and Algebraic Thinking / 2.OA.2 Clarification provided regarding fluency to 20. Mental strategies from 1.OA.6 included.