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..