number system

Which expression has a negative value?

• -12 times -8
• 11 times -6
• -14 + 24

The temperature of a liquid in an experiment starts at 0 C. The experiment calls for the temperature of the liquid to change at a rate of -0.8 C per minute. How long will it take for the liquid to reach -10.8 C? 

• 13.5 minutes
• 8.64 minutes
• 10 minutes
• 11.6 minutes

Which of the following expressions represents a positive number? 

• -4.5 - (-5)
• -1/8 + (-5/8)
• 6.1 + (-6.2)
• -3/4 - (-2/3)

A dozen tamales cost $8.04. What is the cost of each tamale?

• $0.67
• $0.96
• $6.70
• $8.16

What is the value of the expression? 
-27 times 1/3 

• 81
• 9
• -9
• -81

-1/4 + 5/6

• 13/12
• 1 and 1/12
• -7/12
• 7/12

Solve: 
-7/8 divided by -1/3

• 2 and 5/8
• 7/24
• -7/24
• 8/21

-15 + 15 =

• 30
• 0
• -30

12 + ____ = 0

• 9
• 12
• -12

_____ +  (-7.28) = positive number
Fill in the blank.

• 7.25
• 7.8
• 7.2
• 7.24