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Unit 1 - Lesson 19 - Grade 3: Illustrative Mathematics

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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)

Array of Colors

1
1

Tyler’s Trees

Cool Down:

Find the value of each expression mentally.

1
Pitanje 1
1.

10 x 2

1
Pitanje 2
2.

9 x 2

1
Pitanje 3
3.

8 x 2

1
Pitanje 4
4.

7 x 2

Pitanje 5
5.

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

Solve this problem. Explain or show your reasoning.

Pitanje 6
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.

For each problem:

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

  • Solve the problem. Show your reasoning.

1
Pitanje 7
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.

1
Pitanje 8
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.

1
Pitanje 9
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.

1
Pitanje 10
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.

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

1
Pitanje 11
11.

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

1
Pitanje 12
12.

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