This lesson can only be opened if you have the SMART TECHNOLOGIES Notebook Program. The lesson was created using the 2018 Ready Math New York CCLS Resource Book for Second Grade. Lesson 5 is called Add Using Arrays. My class had no background knowledge on arrays so I created slides relating arrays to real life and explaining the difference between a row and a column. Then I added lots of practice building arrays with square tiles. I've even added slides for math fluency drills to the beginning of the lesson.