## Sunday, December 7, 2008

### Big Math Week Ahead

We'll be taking on one of our most challenging math concepts yet this week...Partial Products Multiplication. It's a method that was introduced in third grade with problems such as 68 *6. It involves breaking apart the bigger number into parts. I made a little video for parents and students to use as a reference. Here it is...

But that's not all. We'll introduce two and three-digit times two-digit problems (e.g. 245 * 56) on Tuesday. We'll use the partial products method for this, too. We had tremendous success introducing it last week with a game called "Multiplication Wrestling." Bet you're thinking it would be nice to have a video explaining this process...

But, wait, there's more...

And then we'll be looking at another multiplication method called Lattice Multiplication. Not sure if this was touched on in third grade or not, but I'll have a video for that soon, too.

(Not sure how these videos turned out. Hopefully okay. If you can't view them let me know.)

All of this makes for a busy week in Math. And it all leads to a Unit Five test on December 19. And, of course, we'll have a quiz this Friday, too.

A couple of things to keep in mind with this method of muliplication that we're studying...if students have trouble picking it up, we'll be continuing to work with it later in the year (and in fifth grade, as well). Also, it's VERY different from the method you and I learned in school. If your child knows how to use that one or it's one you teach them, that's definitely okay. This gives them a different choice. They can use what works best for them. But know this...the Partial Products Method is grounded in the Distributive Property, a huge concept in high school Algebra! And I guarantee they'll see it on the ACT. Pretty crazy, huh?

Looking for more online help with this month's math unit? Try this link and let me know what you think:

Unit Five Activities/Resources

There's a lot more to tell you about. But I'm going to have to save it for a later post. Happy Multiplying.