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### Course: Class 8 (Foundation)>Unit 2

Lesson 2: Multiplying fractions

# Multiplying fractions word problem: bike

This video is all about understanding how to multiply fractions and mixed numbers. Watch as the steps are explained in a simple and fun way. Created by Sal Khan.

## Want to join the conversation?

• isn't 3 1/3's improper fraction supposed to be 10/3
• Hey, the answer is 10/3 but he just did 9/3 + 1/3 to simplify how to find ten thirds here
• I didn't get really why we should multiply! I do on paper though. But Sal understand that right way! Can someone explain that why should we multiply?
• As you learn word problems, you will find that there are a variety of formulas that occur and that you need to learn. This problem uses one of those formulas. Specifically, it used the formula: Distance = Rate (Time).

Sal knows this formula, so he knows he needs to multiply the speed/ rate (the 1/5 miles per minutes) times the time (the 3 1/3 minutes).

Hope this helps.
• Is there a quicker way and easier way ?
• umm, why did he not simplify the 10 and the 5 before multiplying them? that would have make things much easier
• He could but maybe it would be easier for some people if he does the other way.
• There is a much easier way and less complicated way. You don’t have to do all the complex steps that sal has shown. He is just showing different ways to do it so hopefully you might get it. Start with 1/5 x 3 1/3. 3 1/3 can be changed to 10/3 * 1/5 =10/15. Then you can simplify to 2/3 which gives you the answer. Hope this helps!
• If I'm being honest the way he explains things is very confusing. I couldn't understand the lesson.