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### Course: 4th grade (2018 edition)>Unit 2

Lesson 6: Division: place value and area

# Division using place value

Sal uses an understanding of place value to divide 5600÷8 and 846÷2.

## Want to join the conversation?

• How Sal could divide before multiply. According to PEMDAS multiplying come first?
• PEMDAS, Parenthases, exponents, multiplication, division, addition, subtraction.

This order is correct, but you sometimes also see BEDMAS, brackets, exponents... and so on. This is because +- can be done in either order, the same is also true for */
• This is off topic but can you divide by 0?
• This is a very good question, and the answer is important to understand.

Division by 0 is not a well-defined operation. There are two situations to consider when dividing by 0. If you take calculus later on, you will need to be able to tell the difference between these two situations.

Situation 1: If we divide 0 by 0, then this is the same as asking what number times 0 is 0. Any number times 0 is 0, so 0/0 can have any value. So 0/0 is called indeterminate.

Situation 2: Let x be any nonzero number (a number other than 0). If we divide x by 0, this is the same as asking what number times 0 is x. No number times 0 can be the nonzero number x, so x/0 cannot have a value. So x/0 is called undefined. Also x/0 can be thought of as positively or negatively infinite, because if we divide the nonzero number x by a number that is very near 0, the answer would be very far from 0.

(Note well: dividing a number by 0 is generally not the same as dividing 0 by a number. Zero divided by any nonzero number is just 0.)
• so if its missing numbers in divison ? divided by 2=8 we can do 8 times 2 that is 16 and 16 is the missing number can it be true.
• Talks about Long Division before even bringing up what it is? Why not introduce it first?
• You won't understand how to do it if you tried to do it first, the Estimation, Area Models and these Division place value questions are there to help prepare your brain and create the right connections it needs to understand by breaking up the numbers, every Concept you do Addition, Subtraction, Multiplication, Division... always require you to see it quite differently so it's worth going through this so you can understand what to do when you get to doing it using Carrying/Regrouping, which is when you'll see it all coming together nicely :)

Each Unit always starts off with this Estimation, Area Model stuff or whatever other stuff it has to get you to break up the numbers first and also encourages you to check your work, THEN the other bit is to start learning to do it as Carrying/Regrouping, with Division however because there's also Remainders involved you've got a bit more preparation to do but it's worth it in the end.
• Is there any way to make it more easier?
• Unfortunately, there are not a lot of shortcuts in math. I would recommend rewatching videos, going over material with your teacher in school, and searching up additional videos/lessons on the current genius of the 21st-century: Google.
• does it work the same as dividing with decimals?
• yes pretty much. only difference is you add the decimal point based on the number of decimal places in the two numbers. example : 2.5/ 2 = 1.25
• This takes sooooooooooooooo long how do i make it speed up
• you go to settings then playback speed and you can speed it up. 2 is the fastest.
• It is a little hard for me.