First Grade Mathematics
Grade One
In Grade 1, instructional time should focus on four critical areas: (1) developing understanding of addition, subtraction, and strategies for addition and subtraction within 20; (2) developing understanding of whole number relationships and place value, including grouping in tens and ones; (3) developing understanding of linear measurement and measuring lengths as iterating length units; and (4) reasoning about attributes of, and composing and decomposing geometric shapes.
 Students develop strategies for adding and subtracting whole numbers based on their prior work with small numbers. They use a variety of models, including discrete objects and lengthbased models (e.g., cubes connected to form lengths), to model addto, takefrom, puttogether, takeapart, and compare situations to develop meaning for the operations of addition and subtraction, and to develop strategies to solve arithmetic problems with these operations. Students understand connections between counting and addition and subtraction (e.g., adding two is the same as counting on two). They use properties of addition to add whole numbers and to create and use increasingly sophisticated strategies based on these properties (e.g., “making tens”) to solve addition and subtraction problems within 20. By comparing a variety of solution strategies, children build their understanding of the relationship between addition and subtraction.
 Students develop, discuss, and use efficient, accurate, and generalizable methods to add within 100 and subtract multiples of 10. They compare whole numbers (at least to 100) to develop understanding of and solve problems involving their relative sizes. They think of whole numbers between 10 and 100 in terms of tens and ones (especially recognizing the numbers 11 to 19 as composed of a ten and some ones). Through activities that build number sense, they understand the order of the counting numbers and their relative magnitudes.
 Students develop an understanding of the meaning and processes of measurement, including underlying concepts such as iterating (the mental activity of building up the length of an object with equalsized units) and the transitivity principle for indirect measurement.
 Students compose and decompose plane or solid figures (e.g., put two triangles together to make a quadrilateral) and build understanding of partwhole relationships as well as the properties of the original and composite shapes. As they combine shapes, they recognize them from different perspectives and orientations, describe their geometric attributes, and determine how they are alike and different, to develop the background for measurement and for initial understandings of properties such as congruence and symmetry.
Grade 1 Overview
Operations and Algebraic Thinking
 Represent and solve problems involving addition and subtraction.
 Understand and apply properties of operations and the relationship between addition and subtraction.
 Add and subtract within 20.
 Work with addition and subtraction equations.
 http://www.corestandards.org/Math/Content/1/OA/
Number and Operations in Base Ten
 Extend the counting sequence.
 Understand place value.
 Use place value understanding and properties of operations to add and subtract.
 http://www.corestandards.org/Math/Content/1/NBT/
Measurement and Data
 Measure lengths indirectly and by iterating length units.
 Tell and write time.
 Represent and interpret data.
 http://www.corestandards.org/Math/Content/1/MD/
Geometry
 Reason with shapes and their attributes.
 http://www.corestandards.org/Math/Content/1/G/
*Information provided from: http://www.corestandards.org/
Grade 1 Tentative Math Pacing Calendar
September 
Topic One 
Solve Addition and Subtraction Problems to 10 
October 
Topic Two 
Fluency Add and Subtract Within 10

October/November 
Topic Three 
Addition Facts to 20: Use Strategies

December 
Topic Four 
Subtraction Facts to 20: Use Strategies

December 
Topic Five 
Work with Addition and Subtraction Equations

January 
Topic Six 
Represent and Interpret Data

January 
Topic Seven 
Extend the Counting Sequence 
February 
Topic Eight 
Understand Place Value

March 
Topic Nine 
Compare TwoDigit Numbers 
March 
Topic Ten 
Use Models and Strategies to Add Tens and Ones

April 
Topic Eleven 
Use Models and Strategies to Subtract Tens 
April 
Topic Twelve 
Measure Lengths

May 
Topic Thirteen 
Time

May 
Topic Fourteen 
Reason with Shapes and Their Attributes

June 
Topic Fifteen 
Equal Shares of Circles and Rectangles 