Common Core Alignment

CCSS.Math.Content.2.OA.4 - Use addition to find the total number of objects arranged in rectangular arrays with up to 5 rows and up to 5 columns; write an equation to express the total as a sum of equal addends.

5: Math

Unit 2: Addition and Subtraction/Fact Power!
Lesson 1: Using Arrays to Add
Lesson 2: So Many More Ways to Add