Multiplying and Dividing Integers
-
Upload
brooke-young -
Category
Education
-
view
39.074 -
download
4
description
Transcript of Multiplying and Dividing Integers
Multiplying and Dividing Integers
Mrs. YoungEMC 1
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 = negative•Negative 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