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### Course: Grade 7 (VA SOL)>Unit 8

Lesson 4: 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!
(1 vote)
• I feel like He sometimes doesn`t always go in depth on how to
do the problem.
• he tries his best to explain hs best but it depends in the end how we understand it
• How did you get two and one-third from 7 over 3?
• When you have 7/3, it means you're dividing 7 into 3 equal parts. Imagine you have 7 apples. If you distribute them equally among 3 people, 2 apples will go to each person. There will be 1 apple left over. So, 7/3 can be expressed as 2 whole parts (2) and 1 part of the 3rd (or 1/3). This gives you 2 1/3 as the final answer.
• at why does sal use a multiplication dot operator as the numerator but a regular multiplication symbol as the other operator?
• bruh it was a mistake
(1 vote)
• 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
• "How many times larger" isn't that means the number larger than the other for how many times? So it should be lager number minus small number and divided by small number. Please tell me if I am thinking in wrong way.
• how did he get the faction with 2? I don't understand where he got it from