# What Are Arrays?

In this lesson, students will explore the characteristics of arrays and find out why they are important. Use this lesson independently or alongside Come Array With Us!
This lesson can be used as a pre-lesson for the Come "Array" With Us lesson plan.
##### View aligned standards
This lesson can be used as a pre-lesson for the Come "Array" With Us lesson plan.

#### Objectives

Students will use addition to find the total number of objects arranged in an array.

##### Language

Students will describe and discuss the characteristics of an array using grade-level academic vocabulary, sentence frames, and story problems.

#### Introduction

(4 minutes)
• Project the How Many Apples? worksheet on the board. Ask students, "What do you notice about these two pictures?" Write the following sentence stem on the whiteboard:
• I notice ________.
• Have students turn and talk, sharing their answers with a peer. Next, say, "I want to figure out how many apples are in each picture. Where should I start?" Have students do a think-pair-share with an elbow partner, sharing their ideas. Provide students with the following sentence stem:
• I can figure out how many apples there are by ________ (insert strategy).
• Allow a student to come up to the front of the class to explain the strategies that would be the most useful in figuring out the total amount of apples. Students may count the apples individually, draw circles around groups and skip count, or refer to the rows and columns in picture B to figure out the total amount of apples.
• Explain to the students that there are 15 apples in each picture. Ask students, "Did it matter how the apples were organized when trying to figure out how many apples there were in all? Was one picture easier to solve than the other? Why or why not?"
• Have a few students share their thinking with the rest of the class.
• Write the word array on the whiteboard. Explain that arrays help us count things in an organized way, and they can also be quite pleasing to look at. Organizing objects in arrays makes sense to our mathematical brains!
• Ask students to stand and choral chant, "An array helps us count things in an organized way," two to three times. Next, have them turn and talk, saying the word "array" to their partner.
• Tell the students that today they will be exploring characteristics of arrays and using arrays to figure out the total amount of various objects.