General Rules
(+)(+) =
(+) or positive
-4.4 x (-6.02)
26.488
A diver descends at a rate of 2 feet per second. What is his location after 7 seconds.
What is -14 feet
3 9/10*(-2 2/3)
-10 2/5
-47(-3)
-141
Describe and correct the error.
2/3*(-3/4)=1/2
The answer should be negative because a positive times a negative is a negative.
(+)(-) =
-
32.436 ÷ (-4.24)
-7.65
The temperature at midnight was 0 degrees Celsius. The temperature is falling at a constant rate of 6 degrees per hour. What is the temperature after 4 hours?
What is -24 degress
-4/11-:2/7
-1 3/11 or -14/11
-75 ÷ - 5
What is 13
Describe and correct the error.
-3/8-:-4/5=-15/32
The answer should be positive because a negative divided by a negative is a positive.
Tell whether the expression is positive or negative without evaluating.
-3/10 * (-8/15)
positive
-7.2 x 0.1 x (-100)
72
How many
1 1/4
pound packages can you make with
7 1/2
pounds of cashews?
6 Packages
-2 3/8*(-1 3/5)
3 4/5
-65/5
What is -13
0.9*(-1.3)=-11.7
The answer should be -1.17. The decimal is in the wrong place since there are two decimal places in the problem, there should be 2 decimal places in the answer.
How is multiplying and dividing rational numbers similar to multiplying and dividing integers?
The same rules for signs of integers are applied to rational numbers.
A 14.5-gallon gasoline tank is
3/4
full. How many gallons will it take to fill the tank?
10 7/8 gallons
As a cold front moved in the temperature dropped a total of 25 degrees over 5 hours. If the temperature dropped at a constant rate, what was the change in the temperature each hour?
-5 degrees or it dropped 5 degrees each hour
The elevation of a sunken ship is -120 feet. Your elevation is
5/8
of the ship's elevation. What is your elevation?
-75 ft
-72 ÷ -6
12
Describe and correct the error.
-34.84-:(-5.2)=-67
The answer should be 6.7. A negative divided by a negative is a positive, and the decimal is in the wrong place.
Tell whether the expression is positive or negative without evaluating.
-6/5-:(-1/2)*6.3*(-0.6)-:2/3*7 7/8-:100
negative
-6(-0.05)(-0.4)
-0.12
How many 2.25-pound containers can you make with 24.75 pounds of almonds?
11 containers
-3/5*2 2/7(-3 3/4)
5 1/7
-7(-3)(-1)(-2)
What is 42
Describe and correct the error.
-1/4-:3/2=-4/1*3/2=12/2=-6
The wrong fraction was inverted (reciprocal).
-1/4-:3/2=-1/4*2/3=-1/6