Find the value of each expression mentally.

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

1. Solve this problem. Explain or show your reasoning. 
2. Represent the situation with an array and a multiplication equation with a symbol for the unknown.
    

For each problem:

• Write a multiplication equation with a symbol for the unknown to represent the situation.
• Solve the problem. Show your reasoning.

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

2. Tyler wants to plant coconut trees in a community garden in Florida. He will plant 2 rows of 4 trees. How many trees will Tyler plant?