General Rules
(+) x (+) =
(+) or positive
-4.4 x (-6.02)
26.488
-5 ÷ 1.5
-3.3
3 9/10 x (-8/3)
-10 2/5
-1 5/6 ÷ 4 1/6
-11/25
Describe and correct the error.
-2.2 x 3.7 = 8.14
The answer should be negative.
-2.2 x 3.7 = -8.14
(-) x (+)=
-9.4 x (-4.7)
44.18
6.4 ÷ (-3.2)
-2
5/8 x (-4/15)
-1/6
-4/11 ÷ 2/7
-1 3/11
What is the definition of an integer?
A positive or negative whole number on the number line that includes the number 0.
Tell whether the expression is positive or negative without evaluating.
-3/10 x (-8/15)
positive
-7.2 x 0.1 x (-100)
72
-15.4 ÷ (-2.5)
6.16
-2 3/8 x -8/5
3 4/5
9/10 ÷ (-6/5)
-3/4
What is Mrs. Armstrong's favorite college football team?
Florida State University Seminoles
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?
3 5/8 gallons
32.436 ÷ (-4.24)
-7.65
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
-4 1/6 ÷ 1 1/3
-3 1/8
***DOUBLE JEOPARDY *** (APK)
The distance between a number and 0 on a number line.
What is absolute value
Tell whether the expression is positive or negative without evaluating.
-6/5 ÷ (-1/2) x -6.3 x (-0.6) ÷ -2/3 x 7 7/8 ÷ -100
negative
-6 x (-0.05) x (-0.4)
-0.12
How many 2.25-pound containers can you make with 24.75 pounds of almonds?
11 containers
-3/5 x (2 2/7) x (-3 3/4)
5 1/7
How many 1 1/4 pound packages can you make with 7 1/2 pounds of cashews?
6 packages
Describe and correct the error.
-1/4 ÷ 3/2 = -4/1 x 3/2 = -12/2 = -6
The wrong fraction was inverted (reciprocal).
-1/4 ÷ 3/2 = -1/4 x 2/3 = -2/12 = -1/6