Download - Do Now 8/16
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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 = ____
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Absolute Value
August 16, 2013
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Agenda
• Learning Goal: I can explain how and when to use absolute value.
• Do Now• How Old is Tiger Woods?• Absolute Value Quickwrite & Practice
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–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| =
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–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
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Try these problems:
(a) |-100| =(b) |33| =(c) |3 - 12| =(d) |12 – 3| =
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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?
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Make 4 Columns
• Fold your paper in half twice hot dog style and label your columns
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Guess their Ages
• Guess the age of each celebrity.• Write down their NAME and your GUESS in
the appropriate column.
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Tiger Woods
Age?
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Ellen Degeneres
Age?
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Jennifer Lawrence
Age?
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Oprah Winfrey
Age?
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Leonardo DiCaprio
Age?
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Barry Bonds
Age?
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Regis Philbin
Age?
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Jeremy Lin
Age?
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Martha Stewart
Age?
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George W. Bush
Age?
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Bill Gates
Age?
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J. K. Rowling
Age?
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Barack Obama
Age?
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Michelle Obama
Age?
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Their Actual Ages!
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Tiger Woods
Age37
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Ellen Degeneres
Age55
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Jennifer Lawrence
Age22
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Oprah Winfrey
Age59
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Leonardo DiCaprio
Age38
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Barry Bonds
Age49
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Regis Philbin
Age81
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Jeremy Lin
Age24
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Martha Stewart
Age72
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George W. Bush
Age67
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Bill Gates
Age57
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J. K. Rowling
Age48
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Barack Obama
Age52
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Michelle Obama
Age49
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Who’s the best guesser?
• How can we calculate who is the best guesser?
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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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