Lesson 19 Solve Problems Involving Arrays
Let’s solve problems involving arrays.
Warm-up Number Talk: One Less Group
Find the value of each expression mentally.
Activity 1 Array of Colors
There are 7 rows. Each row has 5 crayons. How many crayons are there?
Solve this problem. Explain or show your reasoning.
Represent the situation with an array and an equation with a symbol for the unknown.
Activity 2 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.
A field of coconut trees in Mexico has 5 rows of trees. Each row has 9 trees. How many trees are there?
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.
How many trees will Tyler plant?
There are 5 rows of chairs in the room. There are 4 chairs in each row. How many chairs are in the room?
Write a multiplication equation to represent the situation.
Find the value that makes your equation true.