NC.2.OA.4

In this standard, students build rectangular arrays and write repeated addition equations to find the total number of objects in the arrays as a building block for multiplication in Grade 3. Students are expected to create arrays with concrete objects (e.g., counters, bears, square tiles, etc.) as well as pictorial representations on grid paper or other drawings. 

Due to the commutative property of addition, students can add either the rows or the columns and still arrive at the same solution. Students explore this concept with concrete objects (e.g., counters, bears, square tiles, etc.) as well as pictorial representations on grid paper or other drawings. 

*While students are not expected in second grade to partition a rectangle into rows and columns, this standard is related to that concept of dividing a rectangle into rows and columns. With this standard, students should explore how to determine the total number of small squares in a pre-marked array. Exploring a rectangle already partitioned into rows and columns is a precursor to learning about the area of a rectangle and using arrays and repeated addition as representations and strategies to support multiplicative thinking.