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