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Multiplying Fractions/Decimals Absent Copy 1/3,4PowerPoint Presentation

Multiplying Fractions/Decimals Absent Copy 1/3,4

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Multiplying Fractions/Decimals Absent Copy 1/3,4

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- Multiply: write answer in simplest form.
3 • 7

4 9

3 • 7 = 21

4 • 9 36

Num. Denom.

21 36

7 • 3 2 • 2 • 3 • 3

7 • 3

2 • 2 •3 • 3

Solution

- Do we need to get a common denom. when we multiply?
- YES or NO

- 1. You can multiply straight across.
- 2. You can cross reduce(only if you can) and then multiply across.

- YES or NO

- A T-chart

7

12

- Multiply: write answer in simplest form.
-2 ¾(½)

-2 ¾ = -11

4

-11 • 1 = -11

4 2 8

-1 3/8

Solution

- What do we do first before multiplying?
We need to change the mixed fraction into an improper fraction.

- There are 2 ways to multiply.
- 1.You can multiply straight across.
- 2.You can cross reduce (only if you can) and then multiply across.

- Can we reduce are answer?
- YES or NO

-1 3/8

- Multiply:
-0.06(9.3)

-0.06

x9.3

018

+ 0540

0558

0.558

Solution

- How can we re-write this problem before multiplying?
- Stack the numbers on top of each other before you multiply.
- Do we need to line up the decimals when we multiply?
YES or NO

- After we multiply how many decimals places do we have to move in the answer?
- We have to move the decimal 3 places.
- Do we move the decimal left or right when making the final answer?
- We move the decimal to the left from the back of the answer.
- What is the integer rule we use?
- Neg. # multiplied by a pos. # is always a neg. answer.

-0.558

- Multiply:
-6.7

x -0.8

536

+000

536

5.36

Solution

Solution

- After we multiply how many decimals places do we have to move in the answer?
- We have to move the decimal 2 places.
- Do we move the decimal left or right when making the final answer?
- We move the decimal to the left from the back of the answer.
- What is the integer rule we use?
- When multiplying a neg. # by a Neg. # the answer is always positive.

5.36