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### Course: Get ready for 4th grade>Unit 3

Lesson 7: Distributive property

# Properties and patterns for multiplication

Sal changes the order of numbers or decomposes numbers to simplify multiplication problems.    Created by Sal Khan.

## Want to join the conversation?

• i think Sal goes a little fast,like i like him ive infer many things because of him but, he just says stuff a little fast and he moves on to other things really fast so what i am saying is, it might help to pause the video and read the stuff he is saying down below if your a beginner
😊😊😊😁😁😁
hope

this

helps
• If you want to make it easier to understand, you can just go to settings and click Playback Speed and then choose a different speed.
• what grade do u learn these concepts?
• You learn them around 1st to 3rd grade depending on your school. There are exceptions of kindergarten and 4th grade though.
• how would you solve (6x4)x5
can you solve that or no because the 5 should be in the front
• You would solve that still as normal, but follow the order of operations(Parentheses, Exponents, Multiplication & Division, Addition & Subtraction) and do (6x4) first, then multiply that by 5. You could rearrange the equation as 5x(6x4) and the answer would still be the same, because of the Communicative Property. You would always do the expression within the parentheses first because that's how the order of operations goes. With these numbers though, you can rearrange the numbers however you want(whichever one makes it look the simplest to you) and the answer would always be the same, just make sure the operators stay the same(i.e don't turn the multiplication into division or subtraction).
• why arent you following the order of operations? paranthesis first right?
• I assume you are referring to about in the video where Sal changes 4*(5+2) into 4(5)+4(2).
Sal is using the distributive property. It distributes multiplication across addition or subtraction. It is an acceptable way of eliminating parentheses.
Hope this helps.
• So is it like the more numbers you have, the more patterning strategies you have?
What I mean by is that if you have 9x7+9x2+9x5x7, you have more pattern strategies?
• Not exactly like if you have 3,1and9 you have less strategies than 1274.
• Guess what? Watching these videos is about the same as watching a teacher at school writing these problems on a white board. But here's the difference. The teacher at school will tell you how one time. With videos, if you don't understand it, you can have the teacher (Mr. Khan) tell you over and over until you do understand. In any way, he can help you.
• open na noor