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Unit 1 - Lesson 19 - Grade 3: Illustrative Mathematics

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Last updated 2 months ago
12 Questions
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Grade 3 Unit 1
Lesson 19: Solve Problems Involving Arrays
CC BY 2021 Illustrative Mathematics®
Grade 3 Unit 1
Lesson 19: Solve Problems Involving Arrays
CC BY 2021 Illustrative Mathematics®
Lesson: Solve Problems Involving Arrays

Number Talk: One Less Group (Warm Up)

Find the value of each expression mentally.
1.

10 x 2

2.

9 x 2

3.

8 x 2

4.

7 x 2

Array of Colors

5.

There are 7 rows. Each row has 5 crayons. How many crayons are there?

Solve this problem. Explain or show your reasoning.

6.

There are 7 rows. Each row has 5 crayons.

Represent the situation with an array and an equation with a symbol for the unknown.

Tyler’s Trees

For each problem:
  • Write an equation with a symbol for the unknown to represent the situation.
  • Solve the problem. Show your reasoning.

7.

A field of coconut trees in Mexico has 5 rows of trees. Each row has 9 trees.

Write an equation with a symbol for the unknown to represent the situation.

8.

A field of coconut trees in Mexico has 5 rows of trees. Each row has 9 trees. How many trees are there?

Solve the problem. Show your reasoning.

9.

After learning about growing coconuts in Mexico, Tyler wants to plant coconut trees in his backyard in Florida. His mom will only let him plant 2 rows of 4 trees in his backyard.

Write an equation with a symbol for the unknown to represent the situation.

10.

After learning about growing coconuts in Mexico, Tyler wants to plant coconut trees in his backyard in Florida. His mom will only let him plant 2 rows of 4 trees in his backyard.

Solve the problem. Show your reasoning.

Cool Down:
Clare has 3 rows of baseball cards. Each row has 10 cards. How many cards does she have?
11.

Write an equation with a symbol for the unknown number to represent the situation.

12.

Find the number that makes the equation true. Explain or show your reasoning.