Lesson 16
Arrange Objects Into Arrays
Lesson Purpose
The purpose of this lesson is for students to describe arrays and arrange objects into arrays.
Lesson Narrative
In grade 2, students were introduced to arrays and related them to addition expressions and equations. In this lesson, students deepen their understanding of arrays as they arrange physical objects and relate arrays to multiplication and equal groups. Students use connecting cubes to represent arrays in Activity 2 and in the cooldown.
When working with array situations, students may see the equal groups in an array in either the rows or the columns. For example, when representing 3 rows of 5 chairs, they may create a 3 by 5 array or a 5 by 3 array. This is fine as long as students can correctly describe where the “3 rows of 5 chairs” are in their array. Students will learn about commutativity in the last lesson in this section, so if questions about commutativity arise, record them publicly for discussion in that lesson.
 Representation
 MLR8
Learning Goals
Teacher Facing
 Build arrays with physical objects and describe them in terms of multiplication.
 Describe an array as an arrangement of objects into rows with an equal number of objects in each row and into columns with an equal number in each column.
Student Facing
 Let’s make some arrays.
Required Materials
Materials to Gather
Required Preparation
Activity 2:
 Each group of 2 needs 60 cubes.
Lesson Timeline
Warmup  10 min 
Activity 1  15 min 
Activity 2  20 min 
Lesson Synthesis  10 min 
Cooldown  5 min 
Teacher Reflection Questions
In previous grades, students saw examples of arrays, such as 10frames, and counted objects arranged in arrays. How does that previous experience support their work with equal groups in arrays in this lesson?
Suggested Centers
 Capture Squares (1–3), Stage 5: Multiply with 2, 5, and 10 (Addressing)
 Five in a Row: Multiplication (3–5), Stage 1: Factors 1–5 and 10 (Addressing)
Print Formatted Materials
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Additional Resources
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