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Lesson 3: Visualize percents

# Finding percentages with a double number line

In this math problem, we determine the percentage of students taking the bus to school in a class of 28. By using a double number line, we find that 21 out of 28 students take the bus, which is 3/4 of the class. Converting this fraction to a percentage, we discover that 75% of the students ride the bus to school. Created by Sal Khan.

## Want to join the conversation?

• This is so confusing
• I know right!?
• how I can improve my math's skill?
• you have to be Asian
• Couldnt you just turn 21/28 into 3/4 then 3/4 into 75%?
• Indeed, but I think Sal purposefully showed us how to use the double number line
• What's a douber-no, tubble number line?
• How do you find an answer if you don't have a clue to it?
• this is so hard he does not even tell us how to do it