Do Now 8/16Please do this on a separate sheet of paper, not in a journal. You will need two pieces of paper today.
a) 12 – 7 = ___b) 7 – 12 = ___c) Is your answer to question (a) and (b) the same?
Why or why not?
d) WITHOUT solving this problem, HOW do you know if the answer is positive or negative?
534 – 944 = ____
Absolute Value
August 16, 2013
Agenda
• Learning Goal: I can explain how and when to use absolute value.
• Do Now• How Old is Tiger Woods?• Absolute Value Quickwrite & Practice
–5 –4 –3 –2 –1 0 1 2 3 4 5
A number’s absolute value is its distance from 0 on a number line.
4 units 4 units
|–4| = |4| =
–5 –4 –3 –2 –1 0 1 2 3 4 5
A number’s absolute value is its distance from 0 on a number line.
4 units 4 units
|–4| = 4 |4| = 4
Try these problems:
(a) |-100| =(b) |33| =(c) |3 - 12| =(d) |12 – 3| =
Is it the same?
• Look at your Do Now.We said that 12 – 7 = 5 and that 7 – 12 = -5.
1) What about |12 – 7| and |7 – 12|? Will the answers be the same?
2) What about 7 – 12 and|7 – 12|? Will the answers be the same?
Make 4 Columns
• Fold your paper in half twice hot dog style and label your columns
Guess their Ages
• Guess the age of each celebrity.• Write down their NAME and your GUESS in
the appropriate column.
Tiger Woods
Age?
Ellen Degeneres
Age?
Jennifer Lawrence
Age?
Oprah Winfrey
Age?
Leonardo DiCaprio
Age?
Barry Bonds
Age?
Regis Philbin
Age?
Jeremy Lin
Age?
Martha Stewart
Age?
George W. Bush
Age?
Bill Gates
Age?
J. K. Rowling
Age?
Barack Obama
Age?
Michelle Obama
Age?
Their Actual Ages!
Tiger Woods
Age37
Ellen Degeneres
Age55
Jennifer Lawrence
Age22
Oprah Winfrey
Age59
Leonardo DiCaprio
Age38
Barry Bonds
Age49
Regis Philbin
Age81
Jeremy Lin
Age24
Martha Stewart
Age72
George W. Bush
Age67
Bill Gates
Age57
J. K. Rowling
Age48
Barack Obama
Age52
Michelle Obama
Age49
Who’s the best guesser?
• How can we calculate who is the best guesser?
Exit Ticket:
True or False:If two numbers are opposites,
then they have the same absolute value.
Give me an example of why you picked true or false..
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