►This site was originally created for my kids and their cousins, because we did science together. We eventually added more friends and I ended up having science classes for five years. I am no longer adding to the site (since 2014), but will leave it up for others' use. I do post to facebook occasionally if I come across something to share. =)

►Please accept my apology for any broken links or videos that do not work. I am always disappointed when people take down their videos from YouTube. It makes it hard to find just the right replacement. And because the videos were posted years ago, I usually have no recollection of what the video was about.
I kept thinking I would have time after my kids graduated, but life has filled up my free time with new responsibilities. =)

►Please do not email, asking me to post your website link, or to review something to put on my site. Any resources posted on this site are things I had found on my own during my regular searching for material I needed at the time, and liked it well enough to post here. There have never been any affiliates on my site, and as it is no longer active, would not be worthwhile at this point. ;)
Thank you!

Commutative and Associative Properties of Multiplication

(1) Commutative Property of Multiplication - YourTeacher.com
Commutative is changing the order, even in a problem with 3 or more terms.
You commute to work, and pass the gas station, the library, and Walmart.
On the way home, you decide to go by the library first, then Walmart, then the gas station.
You commuted in a different route.

(2) Associative Property of Multiplication - YourTeacher.com
Associative is changing the grouping.  9 x (3 x 6) = 9 x (6 x 3) is not changing the grouping.  That is an example of the commutative property.
Jack and Tom are your best friends.  Sometimes you go to Jack's house; sometimes you go to Tom's house.  Sometimes Tom and Jack go to each other's houses.  You can associate with either friend, and you are all still friends no matter what grouping you are in.  You, Tom, and Jack.

(3) Commutative and Associative Property - MuchoMath (Professor Perez and Charlie)

(4) In this video, you can pause and work out the problems yourself, then see if you are right.