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Lesson 9: Working with powers of 10

# Approximating with powers of 10

How much larger was the world population than the US population in 2014? We can use division and powers of 10 to get a sense of just how many times as large the world population was. Is there really such a big difference between 10 to the 8th and 10 to the 9th? You bet there is!

## Want to join the conversation?

• why area the videos easy problems and the practice questions are harder
• They're using easy questions in the videos as examples so we can get prepared for the practices, that have harder questions, more easily. But sometimes you might find the questions from videos in the pratices with the same topics!
• im khanfused
• HA! Same...
• I feel like He sometimes doesn`t always go in depth on how to
do the problem.
• the first thing I ever thought to myself about this video was wow! The world has really gotten smaller but still...
I won't think about it... haha
• at why does sal use a multiplication dot operator as the numerator but a regular multiplication symbol as the other operator?
• how did he get the faction with 2? I don't understand where he got it from
• He simplified 7/3 by converting it from an improper fraction into a mixed number. So 7/3 is equal to 2 1/3, just in a different form. Hope this helps, it took me a minute to figure it out too.
• why does the 2 and one third looks like a 1 over 23 :skull: