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Playlist Fractions and Decimals 14 videos
Worried about adding and subtracting fractions? Never fear. It's so easy that it will only take up a fraction of your time: just use multiplication...
This video explains how to convert between decimals, percents, and fractions. All three of these languages are just different ways of showing parts...
We're .999 sure you can figure out how to convert decimals to percents and vice versa, but just in case, take a look at this video. We're 100% sure...
Converting Decimals 1956 Views
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Description:
This video explains how to convert between decimals, percents, and fractions. All three of these languages are just different ways of showing parts of a whole, so it’s pretty simple to switch between them. After watching this video, you’ll be translating between these mathematical languages like you’re a native speaker. Can you say trilingual?
Transcript
- 00:07
Converting Decimals, Percents, and Fractions, a la Shmoop.
- 00:11
You could think of decimals, percents, and fractions as three different languages for
- 00:15
numbers. Naturally, you sometimes need to translate
- 00:17
from one language to another. And lucky you, we’re here to help.
- 00:21
This is where conversion comes in. Conversion is the time-honored Western tradition
Full Transcript
- 00:26
of forcing others to believe exactly the same things that you do.
- 00:30
Actually, we’re talking about converting one “language” of a number into another.
- 00:35
For example, your “friend” got detention two out of five days this week.
- 00:39
That scenario could be expressed as a fraction. Or it could be expressed as a frantic exclamation,
- 00:45
as in: <<DS voice>> “My parents are going to kill me!”
- 00:49
Or we could turn it into a percentage, by calculating how many detentions your friend
- 00:53
is on pace for over the course of 100 days. Remember, percent really means “per hundred.”
- 01:00
Five times twenty equals one hundred, so we also multiply two times twenty, which equals
- 01:05
forty. Now we have forty over one hundred, or forty
- 01:09
percent. That 40% detention rate could also be expressed
- 01:12
as 40 point zero percent. When you start listing your detention percentage
- 01:17
with a decimal point, it may be a wake up call to get some help.
- 01:21
To convert forty percent into a decimal, we simply move the decimal point two places to
- 01:26
the left. This gives us the decimal zero point four.
- 01:29
Great batting average. So two-fifths equals forty percent equals
- 01:34
zero point four. Let’s try a quick drill.
- 01:37
What percent is zero point nine? Ninety percent. Good free throw percentage
- 01:42
for basketball. Bad survival rate for appendectomies. Now let’s turn it into a fraction.
- 01:48
Since percent means per hundred, we know ninety percent is really ninety out of one hundred.
- 01:53
We can reduce it to make everything nice and neat.
- 01:57
Ninety and one hundred can both be divided by ten, giving us nine-tenths.
- 02:02
Are you fluent in decimals, percents, and fractions yet?
- 02:04
Don’t worry if you’re only 50% of the way there.
- 02:16
In that case, you only have 60% more to go. Wait…
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