Date post: | 18-Jan-2016 |
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Rules When multiplying and dividing integers
there are two rules:1. When multiplying or dividing integers that
have the SAME sign, the answer is POSITIVE.
Positive x positive = positive Negative x negative = positive
+7 x +12 = +84-6 x –5 = +30
Rules continued…Rule 2:
When multiplying or dividing integers whose signs are DIFFERENT, the answer will always be NEGATIVE.Positive x negative = negativeNegative x positive = negative
+8 x –4 = -32-5 x +7 = -35
Let’s Sing a Song!Multiplying Integers Song (sing to “Dead Bones” tune)
Verse 1 A negative times a negative is a, (um) positive A negative times a positive is a, (um) negativeA negative times a negative is a, (um) positive
These are the rules for signs.Verse 2
If you have the same signs, you get a positive, But if they’re different, you get a negative,
If you have the same signs, you get a positive,Yes, these are the rules for signs.
Let’s Practice!What sign would the answer have in front of the
integer???
-5 x -7 = ???
POSITIVE!!!
How about…
-6 x 9 = ???What sign will be in front of the answer??
NEGATIVE!!!
Try this one!What sign will be in front of the answer???
-81 ÷ +9 = ???
NEGATIVE!!!
Let’s solve some problems!
-8 x –9 =
+72
+4 x +12 =
+48
-45 ÷ +5 =
-9
-63 ÷ +7 =
-9
-8 x –11 =
+88
Remember…When multiplying and dividing integers:
Same signs = a positive
Different signs = a negative