Grade 2 Common Core Standards for
Mathematics
The Common Core State Standards provide
a consistent, clear understanding of what students are expected
to learn, so teachers and parents know what they need to do to
help them. The standards are designed to be robust and relevant
to the real world, reflecting the knowledge and skills that our
young people need for success in college and careers. With
American students fully prepared for the future, our communities
will be best positioned to compete successfully in the global
economy. 
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.

1. 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).

2. 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.

3. 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.

4. 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.
Grade 2 Overview

Operations and Algebraic Thinking

Represent and solve problems involving addition and subtraction.

Add and subtract within 20.

Work with equal groups of objects to gain foundations for
multiplication.

Number and Operations in Base Ten

Understand place value.

Use place value understanding and properties of operations to
add and subtract.

Measurement and Data

Measure and estimate lengths in standard units.

Relate addition and subtraction to length.

Work with time and money.

Represent and interpret data.

Geometry

Reason with shapes and their attributes.

Mathematical Practices

1. Make sense of problems and persevere in solving them.

2. Reason abstractly and quantitatively.

3. Construct viable arguments and critique the reasoning of
others.

4. Model with mathematics.

5. Use appropriate tools strategically.

6. Attend to precision.

7. Look for and make use of structure.

8. Look for and express regularity in repeated reasoning.