View by Category

Loading...

PPT – Converting Fractions to Decimals PowerPoint presentation | free to download - id: 3c4322-NWI1O

The Adobe Flash plugin is needed to view this content

About This Presentation

Write a Comment

User Comments (0)

Transcript and Presenter's Notes

Converting Fractions to Decimals

- Lesson 5.2
- AMSTI 2006

Discussion

- Who can explain what a fraction is?
- Who can explain what a decimal is?
- Can you find a decimal that is equivalent to ¼?
- What method did you use to find this?

Problem of the Day

- Complete the following within 1 minute.
- Compare 5/13 to 4/9
- Compare 0.384 to 0.4

Egyptian Fractions

- The Egyptians of 3000 BC had an interesting way

to represent fractions.Although they had a

notation for 1/2 and 1/3 and 1/4 and so on (these

are called reciprocals or unit fractions since

they are 1/n for some number n), their notation

did not allow them to write 2/5 or 3/4 or 4/7 as

we would today. Instead, they were able to write

any fraction as a sum of unit fractions where all

the unit fractions were different. - A fraction written as a sum of distinct unit

fractions is called an Egyptian Fraction.

Why use Egyptian Fractions Today?

- For two very good reasons
- The first reason is a practical one. Suppose you

have 5 sacks of grain to share between 8 people,

so each would receive 5/8 of a sack of grain in

terms of present-day fractions. How are you going

to do it simply, without using a calculator? You

could try pouring the 5 sacks of grain into 8

heaps and, by carefully comparing them, perhaps

by weighing them against each other, balance them

so they are all the same! But is there a better

way? We will see that using unit fractions makes

this easier. - The second reason is that it is much easier to

compare fractions using Egyptian fractions than

it is by using our present-day notation for

fractions! For instance Which is bigger 5/8 or

4/7? - but remember - you are not allowed to use your

calculator to answer this! Again unit fractions

can make this much simpler. - On this page we see how both of these work in

Egyptian fractions.

Video

- Lets watch a video to preview how to convert

fractions to decimals, the Egyptian way!

(No Transcript)

Converting Fractions to Decimals

- To convert a Fraction to a Decimal manually,

follow these steps - Step 1 Find a number you can multiply by the

bottom of the fraction to make it 10, or 100, or

1000, or any 1 followed by 0s. - Step 2 Multiply both top and bottom by that

number. - Step 3. Then write down just the top number,

putting the decimal place in the correct spot

(one space from the right for every zero in the

bottom number)

Method 1 Converting with Proportions

- Example 1 Express 3/4 as a Decimal
- Step 1 We can multiply 4 by 25 to become 100
- Step 2 Multiply top and bottom by 25
- 3 75
- 4 100

Example 1 continued.

- Step 3 Write down 75 with the decimal place 2

spaces from the right (because 100 has 2 zeros) - Answer 0.75
- Can you explain what we just did?
- Try to express ¼ as a decimal using method 1.

Method 2 Convert by Dividing

- Example 1 to write 5/8 as a decimal, we need

to calculate 5 8 0.625 - 8 v 5.000
- So 0.625 as a decimal.
- Try this example write 4/5 as a decimal using

division (method 2).

Skittles Activity

- Sort your skittles into groups by color.
- Find the fraction of each color.
- Convert your fractions into a decimals.
- Record your data on chart paper.
- Compare and discuss with the class.

Lets Practice!!

- We are going to use this website to fish out some

fractions and decimals. - Lets see how well you understand this lesson.
- Go to www.iknowthat.com
- Select Math in the left margin
- Select Fishy Fractions
- Select Fractions and Decimal Match

If you still dont understand

About PowerShow.com

PowerShow.com is a leading presentation/slideshow sharing website. Whether your application is business, how-to, education, medicine, school, church, sales, marketing, online training or just for fun, PowerShow.com is a great resource. And, best of all, most of its cool features are free and easy to use.

You can use PowerShow.com to find and download example online PowerPoint ppt presentations on just about any topic you can imagine so you can learn how to improve your own slides and presentations for free. Or use it to find and download high-quality how-to PowerPoint ppt presentations with illustrated or animated slides that will teach you how to do something new, also for free. Or use it to upload your own PowerPoint slides so you can share them with your teachers, class, students, bosses, employees, customers, potential investors or the world. Or use it to create really cool photo slideshows - with 2D and 3D transitions, animation, and your choice of music - that you can share with your Facebook friends or Google+ circles. That's all free as well!

For a small fee you can get the industry's best online privacy or publicly promote your presentations and slide shows with top rankings. But aside from that it's free. We'll even convert your presentations and slide shows into the universal Flash format with all their original multimedia glory, including animation, 2D and 3D transition effects, embedded music or other audio, or even video embedded in slides. All for free. Most of the presentations and slideshows on PowerShow.com are free to view, many are even free to download. (You can choose whether to allow people to download your original PowerPoint presentations and photo slideshows for a fee or free or not at all.) Check out PowerShow.com today - for FREE. There is truly something for everyone!

You can use PowerShow.com to find and download example online PowerPoint ppt presentations on just about any topic you can imagine so you can learn how to improve your own slides and presentations for free. Or use it to find and download high-quality how-to PowerPoint ppt presentations with illustrated or animated slides that will teach you how to do something new, also for free. Or use it to upload your own PowerPoint slides so you can share them with your teachers, class, students, bosses, employees, customers, potential investors or the world. Or use it to create really cool photo slideshows - with 2D and 3D transitions, animation, and your choice of music - that you can share with your Facebook friends or Google+ circles. That's all free as well!

For a small fee you can get the industry's best online privacy or publicly promote your presentations and slide shows with top rankings. But aside from that it's free. We'll even convert your presentations and slide shows into the universal Flash format with all their original multimedia glory, including animation, 2D and 3D transition effects, embedded music or other audio, or even video embedded in slides. All for free. Most of the presentations and slideshows on PowerShow.com are free to view, many are even free to download. (You can choose whether to allow people to download your original PowerPoint presentations and photo slideshows for a fee or free or not at all.) Check out PowerShow.com today - for FREE. There is truly something for everyone!

presentations for free. Or use it to find and download high-quality how-to PowerPoint ppt presentations with illustrated or animated slides that will teach you how to do something new, also for free. Or use it to upload your own PowerPoint slides so you can share them with your teachers, class, students, bosses, employees, customers, potential investors or the world. Or use it to create really cool photo slideshows - with 2D and 3D transitions, animation, and your choice of music - that you can share with your Facebook friends or Google+ circles. That's all free as well!

For a small fee you can get the industry's best online privacy or publicly promote your presentations and slide shows with top rankings. But aside from that it's free. We'll even convert your presentations and slide shows into the universal Flash format with all their original multimedia glory, including animation, 2D and 3D transition effects, embedded music or other audio, or even video embedded in slides. All for free. Most of the presentations and slideshows on PowerShow.com are free to view, many are even free to download. (You can choose whether to allow people to download your original PowerPoint presentations and photo slideshows for a fee or free or not at all.) Check out PowerShow.com today - for FREE. There is truly something for everyone!

For a small fee you can get the industry's best online privacy or publicly promote your presentations and slide shows with top rankings. But aside from that it's free. We'll even convert your presentations and slide shows into the universal Flash format with all their original multimedia glory, including animation, 2D and 3D transition effects, embedded music or other audio, or even video embedded in slides. All for free. Most of the presentations and slideshows on PowerShow.com are free to view, many are even free to download. (You can choose whether to allow people to download your original PowerPoint presentations and photo slideshows for a fee or free or not at all.) Check out PowerShow.com today - for FREE. There is truly something for everyone!

Recommended

«

/ »

Page of

«

/ »

Promoted Presentations

Related Presentations

Page of

Home About Us Terms and Conditions Privacy Policy Contact Us Send Us Feedback

Copyright 2018 CrystalGraphics, Inc. — All rights Reserved. PowerShow.com is a trademark of CrystalGraphics, Inc.

Copyright 2018 CrystalGraphics, Inc. — All rights Reserved. PowerShow.com is a trademark of CrystalGraphics, Inc.

The PowerPoint PPT presentation: "Converting Fractions to Decimals" is the property of its rightful owner.

Do you have PowerPoint slides to share? If so, share your PPT presentation slides online with PowerShow.com. It's FREE!