Multiplying integers: Positives and Negatives
Today during class we learned how to multiply integers!
Multiplying positives:
We started off with a very simple question and it was:
(+4) x (+3)= 12
Figuring out the answer is simple if you write the question down first. In this case the question in L.A form would be 4 groups of 3. This means: 3+3+3+3= 12, this is called repeat addition (skip count).
Even if this is a simple question we have to model the question to show our work.
 |
| Remember to group your integer tiles! |
Lets practice on one more multiplying positive integers question.
(2)x(3)=6
2 groups of 3. 3+3=6
Multiplying with negative and positive integers:
(-4)x(3)=
To make this question easier you must write it down in words.
Negative 4 remove groups of positive 3. To remove something that isn't there you must use zero pairs, in this case you have to use 12 (=4x3).
Positive: Blue
Negative: Red
(-2)x(-3)= +6
Negative 2 remove groups of negative 3= positive 6
Remove 2 groups of negative 3:
video: http://www.youtube.com/watch?v=47wjId9k2Hs
To make this question easier you must write it down in words.
Negative 4 remove groups of positive 3. To remove something that isn't there you must use zero pairs, in this case you have to use 12 (=4x3).
Positive: Blue
Negative: Red
Now that you have your 4 groups of 3, like in what we wrote later we have to "remove 4 groups of positive 3".
Negative x Negative multiplying.
(-2)x(-3)= +6
Negative 2 remove groups of negative 3= positive 6
Great job on explaining and on your pictures. that's a great explanation, i really liked your pictures, they were very understandable and easy to read and very simple. great job, also add a video. Also remember to delete all those spaces at the bottom (I do that too) keep up the great work, i really liked it.
ReplyDelete