#### Transcript of Multiplying and Dividing Fractions

photo credit Nasa / Goddard Space Flight Center / Reto Stöckli

**Multiplying and Dividing Fractions**

Bell work 9-18-2013

1. What does 1/8 + 7/9 =?

Multiplying Fractions

Step 1: Multiply the numerators!

SOLVE INDIVIDUALLY!

1. 5/10 x 4/3 =?

2. 2/3 x 6 =?

3. 9/5 x 6/5 =?

4. 1 1/5 x 2 2/3 =?

5. 6/10 x -3/4 =?

6. -1/3 x -1/4 =?

Dividing Fractions

Step 1: Turn the second fraction upside-down!!!

Solve Individually!!!

Ways to remember!!!

Multiplying Fractions

"Multiplying fractions: no big problem,

Top times top over bottom times bottom.

"And don't forget to simplify,

Before it's time to say goodbye"

2. What does 8/17 - 2/3 =?

3. Name 3 different professions, besides a mathematics teacher, that works with fractions in their everyday career?

Question 1:

1/8 + 7/9 =?

Find a common denominator.

Which is 72 because 8 x 9 = 72.

Multiply each fraction's denominator so that it equals 72. (Remember what you do to the denominator you also do to the numerator)

The problem now is 9/72 + 56/72 =?

Add the numerators together, but keep the same denominator.

The answer is 65/72

Question 2:

8/17 - 2/3 =?

Find a common denominator.

Which is 51 because 17 x 3 =51.

Multiply each fraction's denominator so that it equals 51. (Remember what you do to the denominator you also do to the numerator)

The problem is now 24/51 - 34/51 =?

Subtract the numerators, but keep the denominator.

The answer is -10/51

Step 2: Multiply the denominators!

Step 3: Simply!!!

Ex: 4/9 x 1/3 =?

Step 1: 4x1 =

4

Step: 2: 9 x 3 =

27

Answer is

4/27

1. 5/10 x 3/4 =

3/8

2. 2/3 x 6 =

4

3. 9/5 x 6/5 =

2 4/25

4. 1 1/5 x 2 2/3 =

3 1/5

5. 6/10 x -3/4 =

-9/20

6. -1/3 x -1/4 =

1/12

Were You Right!!!

Step 2: Multiply the fractions!

Step 3: Simplify!

Ex: 4/10 divided by 2/3 =?

Step 1: 3/2

Step 2: 4/10 x 3/2 =

12/20

Step 3:

3/5

1. 2/3 divided by 1/4 =?

2. 3/2 divided by 5/3 =?

3. 1/3 divided by -3/4 =?

4. 1 1/5 divided by 2 2/3 =?

5. -1/2 divided by -4 =?

Were You Right!!!

1. 2/3 divided by 1/4 =

2 2/3

2. 3/2 divided by 5/3 =

9/10

3. 1/3 divided by -3/4 =

-4/9

4. 1 1/5 divided by 2 2/3 =

9/20

5. -1/2 divided by -4 =

1/8

Dividing Fractions

FLIP IT!!!

Because dividing is the opposite of multiplying!

Question 3

Share your thoughts!!!

HOMEWORK!!!

1.

Complete handout (Front and back)!

2.

Bring a dessert recipe that has 6 or more ingredients and the serving size of the recipe listed!

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