This is the video for lesson 39 on my web site, Building a Multiplication Table.
In lesson 10, we saw a small multiplication table showing us how to multiply number one through six. This lesson is just an extension of that table where I've extended the multiplication table up through 12.
Recall how to use the multiplication table. If I want to multiply four times seven, what I’ll do is I’ll go down to four along the left and then go to the right along the top to seven and then see where that row and that column intersect and f course the answer is 28.
Now, recall that multiplication is commutative. That’s means that instead of during four times seven, I can also do seven times four. I can go down to the left to seven, go across the top to four and they also intersect at 28 as expected.
Make sure that you have this table memorized and then you can re-create it for yourself very quickly and very easily. That’s very important to it. This will come into play again and again throughout all the method you’ll study.
Recall that multiplication has a zero property. What that mean is simply that any number times zero equals zero which makes sense. Zero groups of something, is just Zero.
Make sure, that you can easily list multiples of any number that you’re given. The way to actually do that is just by reading across the row. So if somebody asks you to list multiple of seven, you would simply say seven, 14, 21, 28, 35, 42, etcetera.
It's very important that you can do that very quickly and easily. You’ll see later that it just comes up again and again and it's a very important skill to have.
Just make sure that you’ve memorize this table and we’ll come back to it again in future lessons.
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