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Who's the Robber?

Analyzing and creating conditional statements

Who’s the Robber?

We are going to create a courtroom scenario in which the jury

is to determine who robbed a bank. We need someone to

play the parts of:

…the remainder of the class is the jury

- The bailiff
- The defense attorney
- The district attorney
- Courtney Smith
- Morgan Button
- Kaitlyn Ford
- Emma Straight

Who’s the Robber?

Members of the jury: You’re job is to determine whether

Courtney Smith robbed the bank. In order to do this, listen to

the testimony. Draw the following chart on your paper to

help you determine if Courtney is the robber.

Blue

Violet

Black

Yellow

Courtney

Morgan

Kaitlyn

Emma

Who’s the Robber? Conclusion

Members of the Jury:

Explain the reasoning used to determine which person drove

each color car.

The statements that you used to draw your conclusions are

called CONDITIONAL STATEMENTS, and this is what we

are talking about today!

Conditional Statements

CONDITIONAL STATEMENT:

Hypothesis: The part after ______

Conclusion: The part after _______

An IF-THEN statement with two parts, an hypothesis and a conclusion.

if

then

Examples of Conditional Statements

CONDITIONAL: ALL panthers are cats

If-Then Form:

CONDITIONAL: The sum of 2 odd integers is even.

If-then Form:

If an animal is a panther, then it is a cat.

If two integers are odd, then their sum is even.

In-Class Practice

Write each statement as an If-Then Statement.

1. Congruent segments are segments that have equal lengths.

2. An equilateral triangle consists of three congruent angles and three equal sides.

If segments are congruent, then the segments have equal lengths.

If a polygon is an equilateral triangle, then it has 3 congruent angles and 3 equal sides.

In-Class Practice

Underline the hypothesis and circle the conclusion of each conditional statement. (Think of how you’d write it in IF-THEN form)

3. VW = XY implies VW XY

4. K is the midpoint of JL if JK = KL

5. Mr. Scroggins sings when all his students get an A on the test.

6. People who live in Texas, live in the US..

In-Class Practice

Provide a counterexample to disprove the statement.

7. If Rachel is 16 years old, then she has obtained her driver’s license.

8. If a number is divisible by 4 then it is divisible by 6.

Maybe she didn’t pass the test

16 is divisible by 4 but not 6

OTHER CONDITIONALS

Switch the hypothesis and conclusion.

CONVERSE:

INVERSE:

CONTRAPOSITIVE:

Negate the hypothesis and conclusion.

Write the converse and then negate the hypothesis and conclusion.

Types of Statements

If p, then q

p q

If it is a rose, then it is a flower.

If NOT p, then NOT q

~ p ~q

If it is NOT a rose, then it is NOT a flower.

“the nots”

If q, then p

q p

“the flips”

If it is a flower, then it is a rose.

If NOT q, then NOT p

~q ~p

“the flip nots”

If it is NOT a flower, then it is NOT a rose.

The Conditional and Contrapositive are related – if one is true, they are both true. The Inverse and Converse are related – if one is true, they are both true or if one is false, they are both false!!

Elaborate!

- Get in groups of 2 – 4 to complete the 2.2 Logical Reasoning (“if-then” statements) Worksheet

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