## Tuesday, December 11, 2012

### Emerald's Scribepost

Today in math, we learned how to multiply positive and negative integers.

These questions are from the sheet that was assigned today.

1. Let's take 3 x 5. This is easy because it's basically like (+3) x (+5) so just simply multiply the two numbers. The answer is 15. If you were to model it using integer chips, it would be like:

To put it in words, it would be 3 groups of 5 are 15.

2. Now let's take (-2) x 7. For this one, you have to first of all multiply the factors, which is 2 x 7 = 14. You have -2 groups with zero pairs 7 times, so then you'd be left with a negative number. Therefore, the answer would be -14. If you were to model this, it would be like:

To put it in words, it would be remove 2 groups of 7.

3. Let's take 2 x (-2). Multiply the factors which is 2 x 2 and the answer would be 4. This one works the same as the last one because we're removing zero pairs, so that means we'll be left with a negative number again. The answer would be -4. If you were to model this, it would be like:

If you were to put this in words, it would be 2 groups of  -2 are -4.

Here's a video for more understanding:

Also check out this link, you enter the numbers and it generates you the answer. Then it will give you an explanation on why that's the answer.

This concludes my scribepost. I hope you understand how to multiply fractions a bit better now. Have a good night! :)

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