5th grade (2018 edition)
Sal regroups 430 five different ways. Created by Sal Khan.
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- Beside the five ways Sal wrote "430" in that table, are there any other ways to write it?(11 votes)
- who invented place value!(3 votes)
- 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.)(2 votes)
- how do you put 29 in 3 different ways?(2 votes)
- 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!(3 votes)
- 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.(2 votes)
- 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.(3 votes)
- 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 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!!(2 votes)
Fill in the table with whole numbers to write 430 in five different ways. So let's think about this a little bit. We could literally view this 4 as 4 hundreds. So it's 4 hundreds. And the 3 is in the tens place, so it's 3 tens. So this is 4 hundreds and 3 tens. But we could rearrange things a little bit. For example, we might only have 3 hundreds. So we took a hundred from the hundreds place, and we could give it to the tens place. So if you take that hundred and give it to the tens place, a hundred is 10 tens. So you've got 10 tens, and then you already had 3 tens. So you're going to have 13 tens right over here. Now, this seems a little confusing. Remember, this is 430. This is 300 plus 130. That's still 430. Likewise, you could view this as 200 plus 230. 230 is the same thing as 23 tens. Same way, you could view this as 100 plus 330. 33 tens is 330. And finally, you could view it as 0 hundreds and 43 tens. 43 tens is 430.