Ms Rodriguez DO NOW Pablo is making a sandwich for a picnic He has 18 slices of turkey and 12 slices of cheese What is the greatest number of sandwiches Pablo can make if he uses all of the turkey and cheese and puts the exact same contents in each sandwich ID: 493630
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Slide1
Opposite of an Opposite
Ms. RodriguezSlide2
DO NOW
Pablo
is making a sandwich for a picnic. He has 18 slices of turkey and 12 slices of cheese. What is the greatest number of sandwiches Pablo can make if he uses all of the turkey and cheese and puts the exact same contents in each sandwich?
3
4
6
18
A golden retriever puppy weighs
3 pounds. How many ounces does he weigh?
16 ounces
48 ounces
54 ounces
100 ouncesSlide3
Quick Review
What is the opposite of 5?
What is the opposite of $100 in debt?
What is the opposite of 20 feet above sea level?
What is the opposite of 10 degrees below zero?Slide4
FOCUS QUESTION
How can we write the opposite of an opposite number?Slide5
What does the “-” symbol mean?
NEGATIVE number.
The opposite of a number.
Example:
How do we write an equation for the opposite of a?
- (a) = - a
Example:
How do we write the opposite of an opposite of -a?
- (-a) = a - (a) = -aSlide6
In general,
The opposite of an opposite is the original number.
EXAMPLE:
Write an equation for the opposite of an opposite of -14
- (-14) = 14 - (14) = -14Slide7
Whole Class Practice
Integer
Opposite
Opposite of Opposite
4
–(4) = – 4
–
(– 4) = 4
150
-6
-9Slide8
PLICKERS
A question will be shown for two minutes.
There are 4 questions.
After two minutes you are to decide which multiple choice answer is the correct response.
Use your
P
lickers
card to show your answer. Slide9
Question 1
Which answer
represents how the answer for the equation below is solved:
- (- 30) =
- (-30) = 30 - (30) = -30
(-30) = 30 - (30) = -30
- (-30) = 30 (30) = 30Slide10
Question 2
Which statement
best explains why 5 and -5 are opposites.
5 and -5 are opposites because they have different symbols.
5 and -5 are opposites because they are the same distance from 0 in opposite directions.
5 an -5 are opposites because they are the same number.Slide11
Question 3
Which integer
represents the opposite of seven degrees below zero?
–7
7
- (-7)Slide12
Question 4
Which equation represents the opposite
of an opposite for 9?
- (9)
- (-9)
-9