# Grade 1 Common Core Math Practice

The focus in Grade 1 is on the following four critical areas:

• Developing understanding of addition, subtraction, and strategies for addition and subtraction within 20
• Developing understanding of whole number relationships and place value, including grouping in tens and ones
• Developing understanding of linear measurement and measuring lengths as iterating length units
• Reasoning about attributes of, and composing and decomposing geometric shapes

### Overview of Grade 1 Standards

#### Operations and Algebraic Thinking

• Represent and solve problems involving addition and subtraction (1.OA.A.1, 1.OA.A.2)
• Understand and apply properties of operations and the relationship between addition and subtraction (1.OA.B.3, 1.OA.B.4)
• Add and subtract within 20 (1.OA.C.5, 1.OA.C.6)
• Work with addition and subtraction equations (1.OA.D.7, 1.OA.D.8)

#### Number and Operations in Base Ten

• Extend the counting sequence (1.NBT.A.1)
• Understand place value (1.NBT.B.2, 1.NBT.B.2.A, 1.NBT.B.2.B, 1.NBT.B.2.C, 1.NBT.B.3)
• Use place value understanding and properties of operations to add and subtract (1.NBT.C.4, 1.NBT.C.5, 1.NBT.C.6

#### Measurement and Data

• Measure lengths indirectly and by iterating length units (1.MD.A.1, 1.MD.A.2)
• Tell and write time (1.MD.B.3)
• Represent and interpret data (1.MD.C.4)

#### Geometry

• Reason with shapes and their attributes (1.G.A.1, 1.G.A.2, 1.G.A.3)

#### Mathematical Practices

• Make sense of problems and persevere in solving them
• Reason abstractly and quantitatively
• Construct viable arguments and critique the reasoning of others
• Model with mathematics
• Use appropriate tools strategically
• Attend to precision
• Look for and make use of structure
• Look for and express regularity in repeated reasoning