# Grade 3 Common Core Math Practice

The focus in Grade 3 is on the following four critical areas:

• Developing understanding of multiplication and division and strategies for multiplication and division within 100
• Developing understanding of fractions, especially unit fractions (fractions with numerator 1)
• Developing understanding of the structure of rectangular arrays and of area
• Describing and analyzing two-dimensional shapes

### Overview of Grade 3 Standards

#### Operations and Algebraic Thinking

• Represent and solve problems involving multiplication and division(3.OA.A.1, 3.OA.A.2, 3.OA.A.3, 3.OA.A.4)
• Understand properties of multiplication and the relationship between multiplication and division(3.OA.B.5, 3.OA.B.6)
• Multiply and divide within 100(3.OA.C.7)
• Solve problems involving the four operations, and identify and explain patterns in arithmetic(3.OA.D.8, 3.OA.D.9)

#### Number and Operations in Base Ten

• Use place value understanding and properties of operations to perform multi-digit arithmetic(3.NBT.A.1, 3.NBT.A.2, 3.NBT.A.3)

#### Number and Operations—Fractions

• Develop understanding of fractions as numbers(3.NF.A.1, 3.NF.A.2, 3.NF.A.2.A, 3.NF.A.2.B, 3.NF.A.3, 3.NF.A.3.A, 3.NF.A.3.B, 3.NF.A.3.C, 3.NF.A.3.D)

#### Measurement and Data

• Solve problems involving measurement and estimation of intervals of time, liquid volumes, and masses of objects(3.MD.A.1, 3.MD.A.2)
• Represent and interpret data(3.MD.B.3, 3.MD.B.4)
• Geometric measurement: understand concepts of area and relate area to multiplication and to addition(3.MD.C.5, 3.MD.C.5.A, 3.MD.C.5.B, 3.MD.C.6, 3.MD.C.7, 3.MD.C.7.A, 3.MD.C.7.B, 3.MD.C.7.C, 3.MD.C.7.D)
• Geometric measurement: recognize perimeter as an attribute of plane figures and distinguish between linear and area measures(3.MD.D.8)

#### Geometry

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

#### 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