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Unit 1 - Lesson 18 - Grade 3: Illustrative Mathematics

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Grade 3 Unit 1
Lesson 18: Represent Arrays with Expressions
CC BY 2021 Illustrative Mathematics®
Grade 3 Unit 1
Lesson 18: Represent Arrays with Expressions
CC BY 2021 Illustrative Mathematics®
Lesson: Represent Arrays with Expressions

How Many Do You See: An Array of Shapes (Warm Up)

How many do you see?

How do you see them?

Represent Array Situations

Directions:
  • Use objects or drawings to represent each situation with an array.
  • Write a multiplication expression to represent the situation.

There are 3 rows of chairs. Each row has 5 chairs.

Write a multiplication expression to represent the situation.

There are 4 rows of cars. Each row has 5 cars in it.

Write a multiplication expression to represent the situation.

There are 2 rows of eggs. Each row has 6 eggs.

Write a multiplication expression to represent the situation.

There are 2 teams of students lined up. Each team has 10 students.

Write a multiplication expression to represent the situation.

Connect Arrays to Expressions

Draw an array for each multiplication expression. Be prepared to share your reasoning.

Draw an array for 2 x 3.

Explain your reasoning.

Draw an array for 5 x 2.

Explain your reasoning.

Draw an array for 4 x 4.

Explain your reasoning.

Cool Down:

There are 2 rows of plants. Each row has 5 plants.

Draw an array to represent the situation.

Write an expression to represent the situation.