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September 28, 2010

- Write your homework in your agenda:
Problem Solving workbook p.

2) If you finished your Performance Task for HW, please make sure your name is on it and put it in the tray.

3) Open your agenda to the behavior card.

4) Graph your Comp Challenge

5) Set up for Cornell Notes.

What am I Learning Today?

How will I show that I learned it?

Correctly multiply fractions and mixed numbers

Use cross cancellation to simplify fractions before multiplying them

Answers

How do I multiply fractions?

- Keep the fractions horizontal.
- Multiply the numerators.
- Multiply the denominators.
- Simplify.

- Keep the fractions horizontal.
- Change the mixed numbers into improper fractions.
- Multiply the numerators.
- Multiply the denominators.
- Simplify.

How do I multiply mixed numbers?

1

2

2

1

2

__

__

__

__

__

__

4

5

5

10

20

4

Multiplying Fractions

Multiply. Write each answer in simplest form.

•

1 • 2

_____

Multiply numerators. Multiply denominators.

=

•

4 • 5

The GCF of 2 and 20 is 2.

=

The answer is in simplest form.

=

1

7

__

__

__

Write 3 as an improper fraction. 3 =

•

14

1

28

4

4

4

7 • 4

7

2

2

2

__

__

__

__

__

__

_____

__

5

2

5

10

5

2

5

2 • 5

Multiplying Fractions and Mixed Numbers

Multiply. Write each answer in simplest form.

3•

Multiply numerators. Multiply denominators.

=

= 2

Write the answer in simplest form, which means writing the answer as a mixed number.

Answers

How do I use cross cancellation when multiplying fractions?

- Compare the first fraction’s numerator with the second fraction’s denominator.
- Identify the GCF between them, then divide the numerator and denominator.
- Cross out the existing numerator and denominator, then rewrite the new one next to it.
- Repeat this process starting with the second fraction.
- No need to simplify

1

4

4

4

5

4

__

__

__

__

__

__

__

15

7

21

7

7

3

15

Multiplying Fractions

Multiply. Write each answer in simplest form.

•

Use the GCF to simplify the fractions before multiplying. The greatest common factor of 5 and 15 is 5.

1

=

•

•

3

1 • 4

_____

Multiply numerators. Multiply denominators.

=

7 • 3

The answer is in simplest form.

=

3

__

__

Write 2 as an improper fraction. 2 =

•

•

57

12

5

3

19

19

12

19

12

3 • 19

8

8

__

__

__

__

__

__

______

__

__

__

13

8

13

8

26

8

8

13 • 2

13

26

Multiplying Fractions and Mixed Numbers

Multiply. Write each answer in simplest form.

• 2

3

Use the GCF to simplify before multiplying.

2

=

= 2

Write the answer as a mixed number.

7

1

5

3

7

1

3

1

5

__

__

__

__

__

__

__

__

__

__

__

__

1

4

2

5

40

5

7

10

5

14

8

4

20

2

grain

Now try these!

Multiply. Write each answer in simplest form.

1. 3 2. 1

Find each product. Write the answer in simplest form.

3. 2•1 4. 5 • 3

5. A nurse gave a patient 3 tablets of a medication. If each

tablet contained grain of the medication, how much

medication did the patient receive?

2

•

•

16

1

1

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