Download - Do Now 8/16

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Page 1: Do  Now 8/16

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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