Lesson 4 Multiplying & dividing positive & negative integers

Evaluate the expression. (-4)(-7)

• -28

• 28

• 11

• -11

Evaluate the expression. (-2)(5)(-6)

• -16

• 16

• -60

• 60

Evaluate the expression. (-3)(7)

• 21

• -21

• 12

• -12

Evaluate the expression.   $\left(-44\right)\div\left(-11\right)$  

• -4

• -11

• 11

• 4

Evaluate the expression.  $\left(36\right)\ \div\left(-4\right)$  

• -9

• 6

• 9

• -6

In which situation do the quantities combine to make 0?

• Kurt deposited $50 into his checking account on Friday. The next week, he deposited $50 into his saving account.

• A football team gained 4 yards on one play and lost 2 yards on the next play.

• The temperature at 10pm was 6^°C. Over the next 3 hours, the temperature decreased by 2°C each hour.

• Marci spends $8 to make a necklace and earns $8 from each bracelet sold. On Saturday, she made 5 necklaces and sold 10 bracelets.

Which is an equivalent expression?  $\left|\left(-7\right)-\left(4\right)\right|$  

•  $\left|-3\right|$  

•  $\left|3\right|$  

•  $\left|\left(-7\right)\ +\ \left(-4\right)\right|$  

• -11

Which situation goes with  the equation  $\left(-3\right)\left(20\right)=\left(-60\right)$  

• John owes 3 people $20, so he owes a total of $60.

• Ming lost 3 points on her first turn in a game. She earned 20 points on her second turn. She has a total of (-60) point.

• The bottom of a pond is 3 meters below sea level. A nearby tower has a height of 20 meters above sea level. The vertical distance from the bottom of the pond to the top of the tower is 60 meters.

• A scientist controls the temperature of a substance so that it decreases by  $3\degree$   per minute over twenty minutes. The temperature decreases by a total of  $60\degree\cdot$  

 $\left|\left(-5\right)\ +\ \left(-7\right)\right|\ =\ -\left|5+7\right|$  

• true

• false

 $\left(-3\right)\ +\ \left(4\right)\ =\ \left(-3\right)\ +\ \left(3+1\right)$  

• true

• false