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### Unit 4: Lesson 11

Regrouping decimal numbers

# Regrouping whole numbers: 430

Sal regroups 430 five different ways. Created by Sal Khan.

## Want to join the conversation?

• Beside the five ways Sal wrote "430" in that table, are there any other ways to write it?
• who invented place value!
• Place value was actually invented by three different cultures. These were the Mayans, the Babylonians, and the Hindus. (so it's not one person, it's a whole culture.)
• how do you put 29 in 3 different ways?
• Well lets see, 2 tens + 9 ones, 1 ten +19 ones, 0 tens + 29 ones
• I don't understand can you make an example just like the question to make the example easier instead of doing hundreds to tens. Like after watching the video multiple times this still makes no sense whatsoever to me!
• Khan Academy is just a tool to help you learn. Even if you don't understand it here you can still find out somewhere else.
• What are the benefits of this kind of calculation? Can I use this to calculate in my head to get faster result?
(1 vote)
• It helps open you mind up to new problems and new calculations. Are you in High School yet? Because algebra is going to kill you if you don't know this stuff. I had such problems trying to master algebra because I thought I had already learned everything I could in math pretty much so I was prepared. Don't do that. Hope this helps.
• so in this video there doing this 400 into the tens the 30 is 300 and so they are just putting the things in different ways.
(1 vote)
• I know there is another way right please tell me mr.khan
(1 vote)
• I’m really lost in all of this its becoming to hard :( ( I’m mean place value)
(1 vote)
• I don't get this can someone help me
(1 vote)
• The video is technically showing us different ways to break apart the number 430 by using place value. So if you add the numbers Sal broke up, the final result will be 430.
Hope this helps!!