Find the Part When the Percent and Total Are Known

This video tutorial teaches how to calculate a part when given a percent and a total using double number lines. It begins by explaining percents as ratios and introduces five methods for solving ratio problems. The tutorial then focuses on using double number lines to solve a specific problem involving the color of cars in a parking lot. It emphasizes understanding the relationship between parts and totals and demonstrates solving the problem using both addition and multiplication strategies.

What does 60% represent in terms of a ratio?

• 60 out of 150

• 60 out of 50

• 60 out of 200

• 60 out of 100

Which of the following is NOT a correct interpretation of the ratio 1 pink sweater for every 5 sweaters?

• 5 pink sweaters out of 25

• 4 pink sweaters out of 20

• 2 pink sweaters out of 10

• 3 pink sweaters out of 15

How many blue cars are there if 60% of 300 cars are blue?

• 200

• 120

• 150

• 180

What is the first step in using a double number line to solve a ratio problem?

• Mark the part-to-total ratio

• Mark the total number of items

• Calculate the percentage

• Draw a graph

Which method can be used alongside addition to solve the double number line problem?

• Multiplication

• Division

• Subtraction

• Graphing