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.

Describe a common mistake when working with ratios.

How can you calculate the number of blue cars if you know the total number of cars and the percent that are blue?