Unit 1, Lesson 18
Represent Arrays with Expressions
Grade 3
Preparation
Lesson Narrative
In a previous lesson, students arranged objects into arrays and described the arrays in terms of equal groups. In this lesson, students write expressions to represent arrays to further connect arrays and multiplication (MP2).
As students connect arrays to expressions, they may write or to represent 3 rows of 5 chairs. This is fine as long as students can correctly describe where the “3 rows of 5 chairs” is represented in their array or expression. Keep collecting ideas that arise about commutativity.
- Representation
- MLR2
- Represent multiplication situations using arrays and multiplication expressions.
- Let’s represent situations with arrays and expressions.
Required Materials
Activity 1
Required Preparation
- Each group of 2 will need 20 connecting cubes or counters.
Teacher Reflection Questions
In an upcoming lesson, students will learn about the commutative property of multiplication. What do you notice in their work from today’s lesson that you might leverage in that future lesson?