ch. 11-3 b & e multiplying & dividing integers. try these… 4 x 7 28 4 x (-7) -4 x 7 -4 x...
TRANSCRIPT
CH. 11-3 B & E
Multiplying & Dividing Integers
Try These…
4 x 728
4 x (-7)
-4 x 7 -4 x (-7)
-28
-28 28
The Rules For Integers!
When multiply or dividing 2 integers with
the SAME sign your answer is always
POSITIVE!!!When multiply or
dividing 2 integers with DIFFERENT signs your
answer is always NEGATIVE!!!
What does multiplying REALLY mean???
When you see a problem like 2 x 3 what it says is
2 groups of 3 positives
6 TOTAL positives
!
What does multiplying REALLY mean???
OK, lets try this one 2 x (-3) !2 groups of 3 negatives
6 TOTAL negatives
!
Now when a negative is first…
When a negative is first it means to take away from the groups! So if you have -2 x 3, it means that you have 2 groups of 3 and you are TAKING away the POSITIVES!
In order to do this you are starting with a Zero Pair so that you have something that you
can take away from!
6 TOTAL negative
s!
Again…what happens with double negatives?!
When a negative is first it means to take away from the groups! So if you have -2 x (-3), it
means that you have 2 groups of 3 and you are TAKING away the NEGATIVES!
6 TOTAL positives
!
More than problem, just go in ORDER!
-5 (-3) (-2)
15 (-2)
-30
NOW…lets try some!
8(-7) -15 ÷ 3
-3 x (-6) 20 ÷ (-4)
-4 x 6 x (-3) -36 ÷ (-6) ÷ (-2)
-56 -5
18 -5
-24 x (-3)
726 ÷ (-2)
-3