Multiplying and Dividing Integers

Multiplying and Dividing Integers

Review for your quiz

How to Multiply Integers

• Here are some Rules to help us when multiplying integers

•  $\left(+\right)\cdot\left(+\right)=\left(+\right)$  a positive times a positive equals a negative

•  $\left(-\right)\cdot\left(-\right)=\left(+\right)$  a negative times a negative equals a positive 

•  $\left(-\right)\cdot\left(+\right)\ =\left(-\right)or\ a\ \left(+\right)\cdot\left(-\right)\ =\left(-\right)$  a positive times a negative or a negative times a positive will always equal a negative number

Examples

 $A.\ 3\cdot4=12$  

 $B.\ -12\cdot-3=36$  

 $C.\ -14\cdot2=-28$  

Multiple Choice

(-4)(6) 

• -24
• 24

Multiple Choice

(-9)(-8)

• -72

• 72

Multiple Choice

(-9)x(-8)

• -72

• 72

• 81

• -81

How to Divide Integers

• the same rules for multiplying integers can be applied to dividing integers

•  $\left(+\right)\div\left(+\right)=\left(+\right)$  a positive divided by a positive equals a negative

•  $\left(-\right)\div\left(-\right)=\left(+\right)$  a negative divided by a negative equals a positive 

•  $\left(-\right)\div\left(+\right)=\left(-\right)\ or\ a\ \left(+\right)\div\left(-\right)=\left(-\right)$  a positive divided by a negative or a negative divided by a positive will always equal a negative number

Examples:

 $A.\ \left(34\right)\div\left(2\right)=17$  
 $B.\ \left(-34\right)\div\left(-17\right)=2$  
 $C.\ -45\div9=5$  

Multiple Choice

64 ÷ (-8)

• 8
• -8
• -9
• -7

Multiple Choice

-18 ÷ (-2)

• 9

• -9

• -20

• 10

Multiple Choice

-18 ÷ (-2)

• 9

• -9

• -20

• 10

For Homework tonight there is a Google form to submit as well.

Please complete Wb pg. 51 #1-10