In the mall parking lot, 60% of the cars are blue. If there are 240 blue cars in the parking lot, what is the total number of cars?

In this lesson you will learn to calculate the total when you know the percent and the part by using a double number line.

Let’s Review A percent is a part-to-total ratio where the second number is always % = 60 percent = 60 for every 100

5 ways to solve a ratio problem 1) Table with addition 2) Table with multiplication 3) Double number lines 4) Tape diagrams 5) Graphing

Let’s Review A Common Mistake Thinking that a ratio describes just one situation Example: 1 pink sweater for every 5 sweaters 1 out of 5 is pink. 2 out of 10 are pink. 3 out of 15 are pink.

Let’s Review Core Lesson KNOW In the mall parking lot, 60% of the cars are blue. If there are 240 blue cars in the parking lot, what is the total number of cars? Percent: CALCULATE 60 for every 100 cars are blue. Part:240 blue cars Total:??? cars

Let’s Review Core Lesson blue cars total cars Part:240 blue cars CALCULATETotal: 400 cars KNOWPercent:60 for every 100 cars are blue

Let’s Review Core Lesson blue cars total cars x4

In this lesson you have learned to calculate the total when you know the percent and the part by using a double number line.

Let’s Review Guided Practice In Nick’s baseball card collection, 40% of his cards are players on the Washington Nationals team. He has 10 Washington Nationals baseball cards. What is the total number of cards in his collection?

Let’s Review Extension Activities Rewrite the example problem from this lesson so that the answer is 600 total cars. See if you can find more than one way to rewrite the problem.

Let’s Review Extension Activities In the mall parking lot, 60% of the cars are blue. If there are 150 blue cars in the parking lot, what is the total number of cars?

Let’s Review Extension Activities On my bookshelf, 25% of the books are non-fiction. If there are 5 non-fiction books on the shelf, what is the total number of books?

Let’s Review Quick Quiz 12% of the students in Ms. Blackwell’s class wear glasses. If there are 3 students who wear glasses, what is the total number of students in the class? Malik spent $140 on a new skateboard. If this spending was 70% of his money, how much money did he have before buying the skateboard?