Integer Integer IncidentsIncidentsInteger Integer

IncidentsIncidents

Multiplication RulesMultiplication Rules

Positive and Negative IntegersPositive and Negative Integers

What are Integers?• Integers include 00

• All of the counting numbers (called positive whole numbers).

• The whole numbers less than 0 (called negative whole numbers).

Integer Number Line

When MultiplyingIntegers…

Like signs are…

Unlike signs are…

positive

negative

Positive Integers• Positive X Positive = Positive

• (+) X (+) = (+)

• +5 X +4 = +20

Mixed Integers• Positive X Negative = Negative

• (+) X (-) = (-)

• +5 X -4 = -20

Mixed Integers• Negative X Positive = Negative

• (-) X (+) = (-)

• -5 X +4 = -20

Negative Integers• Negative X Negative = Positive

• (-) X (-) = (+)

• -5 X -4 = +20

Now on with the Show…

Review the Rules

+ x + = ++ x - = -- x + = -- x - = +

(+) x (+) = (+)

(+) x (-) = (-)

(-) x (+) = (-)

(-) x (-) = (+)

Practice

9 x 7 = 63

5 x (-6) = -30

(-4) x 8 = -32

(-7) x (-6) = 42

More Practice

7 x (-8) = -56

(-9) x (-3) = 27

6 x 4 = 24

(-5) x 10 = -50

Links for Practice

• www.berghuis.co.nz/abiator/maths/sa/saintegermultiply.html

• http://www.aaamath.com/g76-mult-negative.html

• http://www.esu3.org/districts/ralston/hs/rhsweb/multiply.htm

Challenge Site• http://www.gateways2learning.com/Bas

icMath/MultiplyIntegers.html

• http://www.easymaths.org/gr8/Integers/4multint.htm