Examples for

# Common Core Math: Grade 2: Algebraic Thinking

In second grade, students build fluency with adding and subtracting numbers up to 20. Students perform addition and subtraction up to one hundred, including by solving for unknown values in real-world scenarios described in word problems. To build a foundation for multiplication, students practice reasoning with groups of objects, including by determining if a group has an even or odd number of objects and by counting objects arranged in rectangular arrays of rows and columns.

### Common Core Standards

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### Foundations of Multiplication

Reason with equal groups of objects.

#### Determine if a number is even or odd (CCSS.Math.Content.2.OA.C.3):

#### Use repeated addition to count groups of objects (CCSS.Math.Content.2.OA.C.4):

### Addition & Subtraction

Perform addition and subtraction.