In the upcoming years of business, technology, etc. I NEVER thought about the fact that you are actually multiplying ones, tens, and hundreds and multiplying each by each in a three-digit problem until I was an adult. The idea of these methods is to begin to understand how the problem works. I only have 7 kids in my 4th grade math group though, so we can do things like that together.įor my third graders, when we just multiply by 1 digit, I just taught the traditional algorithm. The kids were drawn to the partial products. They were initially confused by the traditional algorithm and we tried a few different ways. When I introduced the larger problems we spent time together trying to figure out the best way. He said, "no, I just saw it was a shortcut so I didn't have to write the numbers so much." I was pretty darn impressed!
#LATTICE METHOD MULTIPLICATION 3 DIGIT HOW TO#
I saw a kid doing this and asked him if his parents showed him how to line the numbers up that way.
The coolest thing with the partial products is after awhile, the kids automatically start to line them up the way we do the traditional algorithm because they get tired of writing the numbers over and over. they solve for 27 x 3, and tack on the zero. Instead, I teach partial products like buck8. I don't teach the lattice because it takes too long to make the thing if they are not premade for the kids, and anyone with any spatial difficulties is incredibly confused by this. I did in 4th and they did it the same way, breaking it down. Of course, I teach third and we don't double digit multplication. They like breaking it down because it's more like how they are used to doing math. Therefore, a lot of my kids forget to add in the tens that they carried. I think it's because we teach addition with regrouping (up and down) in the middle of the year, and they can't use it as a strategy until it's introduced. Some of my kiddos like the traditional algorithm, while some don't. A lot of them like to break it up, for example: Therefore, I'm all about letting the kids use the strategies that are best for them.įor two digit multplication, a lot of my kids perfer repeated addition. I use Investigations (TERC) math as my main math program.
I tried it a few times with some of my struggling 4th graders when I student taught last year. Would it still be ok to teach the lattice method after the kids have mastered the traditional algorithm? I'm just curious about other teacher's views on this. I think that teaching the traditional algorithm is the only way to go even if I have to spend more time having the kids practice. Well, after viewing the video above I'm not so sure anymore. I was excited about finding lattice multiplication because double digit multiplication is a tough concept for a lot of kids. I've never used TERC so I brought home some stuff to look over during the summer. Our school uses Scott Foresman Mathematics and we have TERC as supplemental material. I'm a new teacher and I want to do what is best for the kids. Well, while looking through Youtube I came across this video I didn't want to teach my kids something that I wasn't informed about. I thought it was a cool way of doing multiplication, but I was trying to find more information about it. I've been doing some research on lattice multiplication.
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