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# Adding, Subtracting, Multiplying, and Dividing Fractions - PowerPoint PPT Presentation

Adding, Subtracting, Multiplying, and Dividing Fractions. By: Mr. Menjivar. 09/02/11. 09/02/11. Observe, Question, Comment . Add, Subtract, Multiply, and Divide Fractions. Add, Subtract, Multiply, and Divide Fractions Reflection. Warm-Up:. 8 L. 8 R. Warm-Up.

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### Adding, Subtracting, Multiplying, and Dividing Fractions

By: Mr. Menjivar

09/02/11

Observe,

Question,

Comment

Fractions

Divide Fractions Reflection

Warm-Up:

8L

8R

Change the Improper Fraction to Mixed Number

#1) #2)

Change the Mixed Number to Improper Fraction

#3) #4)

09/02/11

Observe,

Question,

Comment

Fractions

Divide Fractions Reflection

Warm-Up:

Standard

8L

8R

• Number Sense 2.2:Add and subtract fractions by using factoring to find common denominators.

• Number Sense 1.2:Add, subtract, multiply, and divide rational numbers (fractions).

09/02/11

Observe,

Question,

Comment

Fractions

Divide Fractions Reflection

Warm-Up:

Standard

Objective

8L

8R

• To add and subtract fractions

• To multiply and divide fractions

09/02/11

Observe,

Question,

Comment

Fractions

Divide Fractions Reflection

Warm-Up:

Standard

Objective

Vocabulary

8L

8R

• Are numbers expressed as the ratio of two numbers

• Tells the desired outcome

• Tells you how many things are there in total

• They’re fractions where the numerator is bigger than the denominator.

09/02/11

Observe,

Question,

Comment

Fractions

Divide Fractions Reflection

Warm-Up:

Standard

Objective

Vocabulary

Notes/Examples

8L

8R

There are a few “special” fractions

How do you write 7 as a fraction?

7

1

How do you write 1 as a fraction?

3 101

3 101

How do you write 0 as a fraction?

0 0

5 100

• (Use GCF if lost…)

09/02/11

Observe,

Question,

Comment

Fractions

Divide Fractions Reflection

Warm-Up:

Standard

Objective

Classwork #1

Vocabulary

Notes/Examples

8L

8R

1.) 4.)

2.) 5.)

3.)

09/02/11

Observe,

Question,

Comment

Fractions

Divide Fractions Reflection

Warm-Up:

Standard

Objective

Classwork #1

Vocabulary

Notes/Examples

Back To The NOTES!!!!!!!!!!!!!

8L

8R

• Step 1: Get a Common Denominator

• Step 2: Make the denominators the same

• Step 3: Change numerators accordingly

• Step 4: Perform necessary operation

Parallel ExampleTeacher (left) ; Student (right)

Parallel ExampleTeacher (left) ; Student (right)

• Suppose one day you rode a bicycle for hours and jogged for hours. How many hours did you exercise?

09/02/11

Observe,

Question,

Comment

Fractions

Divide Fractions Reflection

Warm-Up:

Standard

Objective

Classwork #1

Classwork #2

Vocabulary

Notes/Examples

8L

8R

09/02/11

Observe,

Question,

Comment

Fractions

Divide Fractions Reflection

Warm-Up:

Standard

Objective

Classwork #1

Classwork #2

Vocabulary

Homework

Notes/Examples

8L

8R

• Pg. 313 [1-6 all and 13-16 all]

• Pg. 314 [1-11 all]

All you do is multiply straight across!

Parallel ExampleTeacher (left) ; Student (right)

Parallel ExampleTeacher (left) ; Student (right)

Dividing is just like multiplying…

EXCEPT!!!

You are going to multiply the first fraction by the reciprocal of the second fraction.

What is a reciprocal?

It is the flipped version of a fraction.

The reciprocal of

4 5

5 4

Lets Take The ReciprocalOf Each Number

• 5

Parallel ExampleTeacher (left) ; Student (right)

Parallel ExampleTeacher (left) ; Student (right)

BrainPop Multiplying and Dividing Fractions

• Break Time!

09/01/11

Observe,

Question,

Comment

Fractions

Divide Fractions Reflection

Warm-Up:

Standard

Classwork

Objective

Vocabulary

Notes/Examples

8L

8R

09/01/11

Observe,

Question,

Comment

Fractions

Divide Fractions Reflection

Warm-Up:

Standard

Classwork

Objective

Homework:

Vocabulary

Notes/Examples

8L

8R

• Pg. 315 [1-8 all and 11-17 all and 21-23]