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View Full Version : The number 87.2 is what percent of 436?

swoll1980
March 19th, 2009, 01:07 AM
87.2 = a436
a = 87.2/436 = 0.2 = 20%

Am I doing this right? not as much worried about the answer as I am about whether it's written correctly

Ozor Mox
March 19th, 2009, 01:24 AM
Yes, (87.2 / 436) * 100 gives you the percentage.

Bölvağur
March 19th, 2009, 01:30 AM
yes this is absolutely correct.

87.2 = a · 436
87.2 = a · 436
87.2 / 436 = a · 436 / 436
87.2 / 436 = a

= 0.2

Grant A.
March 19th, 2009, 01:35 AM
Just use a proportion

87.2..........x
____ =...___
100..........436

butterfly them

100x = (87.2*436)

divide

100x...(87.2*436)
___..=....___
100.......100

simplify (87.2*436)/100

And since I don't have a calculator on me... good luck!

What is this for, BTW?

swoll1980
March 19th, 2009, 01:42 AM
Just use a proportion

87.2..........x
____ =...___
100..........436

butterfly them

100x = (87.2*436)

divide

100x...(87.2*436)
___..=....___
100.......100

simplify (87.2*436)/100

And since I don't have a calculator on me... good luck!

WUH? :shock:

What is this for, BTW?

Home work

swoll1980
March 19th, 2009, 01:46 AM
Yes, (87.2 / 436) * 100 gives you the percentage.

I left out the *100 #-o

so it should look like

a = 87.2/436 = 0.2*100 = 20%

I did it in my head but forgot to write it. Thanks!

Faolan84
March 19th, 2009, 02:55 AM
Why am I the only person that thinks fractions are easy?

MaxIBoy
March 19th, 2009, 02:57 AM
Home workNot an allowed topic on this forum.

And yeah, fractions are a piece of cake.

swoll1980
March 19th, 2009, 03:15 AM
Not an allowed topic on this forum.

And yeah, fractions are a piece of cake.

I think your not allowed to ask people to do your homework for you? This was done just wanted to make sure I was doing it right before I wasted a 1/2 hour of my life doing it wrong.

NE Key
March 19th, 2009, 03:24 AM
I think your not allowed to ask people to do your homework for you? This was done just wanted to make sure I was doing it right before I wasted a 1/2 hour of my life doing it wrong.

If it was English home work;

I think you are..
or
I think you're...(colloquial)
but not;
I think your...

It helps if you can write the language.

gnomeuser
March 19th, 2009, 11:29 AM
Why am I the only person that thinks fractions are easy?

No child left behind.. also mankind is doomed.. doomed I tell you.

kevdog
March 19th, 2009, 11:36 AM
Get a calculator!

billgoldberg
March 19th, 2009, 11:42 AM
Why am I the only person that thinks fractions are easy?

Because they are.

billgoldberg
March 19th, 2009, 11:45 AM
i left out the *100 #-o

so it should look like

a = 87.2/436 = 0.2*100 = 20%

i did it in my head but forgot to write it. Thanks!

87.2/436 = 0.2

0.2 = 20/100= 20%

Bölvağur
March 19th, 2009, 01:35 PM
I left out the *100 #-o

so it should look like

a = 87.2/436 = 0.2*100 = 20%

please do not write it like that.
0.2 = 20%
0.2 * 100 != 20%

0.2 = 20/100= 20%

this is correct

you can think of % as equal to 1/100, like cm is to m

mips
March 19th, 2009, 02:24 PM
I think your not allowed to ask people to do your homework for you? This was done just wanted to make sure I was doing it right before I wasted a 1/2 hour of my life doing it wrong.

May I ask what grade you are in? Justs curious in which year this is taught.

billgoldberg
March 19th, 2009, 02:37 PM
you can think of % as equal to 1/100, like cm is to m

% -> "per hundred"

:p

swoll1980
March 19th, 2009, 06:09 PM
May I ask what grade you are in? Justs curious in which year this is taught.

It's problem solving 1 a college course. It's the an introductory math class, so this is more of a review we're also doing things like ratios, and proportions. I haven't done this stuff in 15 years, so I'm glad it's staring off slow.

swoll1980
March 19th, 2009, 06:12 PM
Get a calculator!

Read the op. You try do make a smart remark, but you end up sounding like an idiot because you didn't read the op. The answer is not important it's the equation that has to be correct, and written correctly. What good would a calculator do me? I'm certain I have it right though because my teacher confirmed it today.

swoll1980
March 19th, 2009, 06:18 PM
please do not write it like that.
0.2 = 20%
0.2 * 100 != 20%

this is correct

you can think of % as equal to 1/100, like cm is to m

yeah 0.2 = 20% 0.2 x 100 != 20% I caught that last night. Thank you though.

mips
March 19th, 2009, 06:19 PM
it's problem solving 1 a college course.

Not being from the US 'college' makes no sense to me, what would the equivalent year of study be then?

swoll1980
March 19th, 2009, 06:25 PM
Not being from the US 'college' makes no sense to me, what would the equivalent year of study be then?

It would be 1rst year of college, so 13th all together. I'm sure they teach this stuff in like 7th grade though.

stchman
March 19th, 2009, 06:43 PM
I cannot believe that a simple percentage problem is getting this much attention.

swoll1980
March 19th, 2009, 06:59 PM
I cannot believe that a simple percentage problem is getting this much attention.

I can't believe it's not butter.

mips
March 19th, 2009, 11:41 PM
It would be 1rst year of college, so 13th all together. I'm sure they teach this stuff in like 7th grade though.

That's kinda what I was working towards ;)

swoll1980
March 19th, 2009, 11:47 PM
That's kinda what I was working towards ;)

It's an introductory math class. I could have tested out of it, but I haven't done this stuff in 15 years, or so.

mips
March 20th, 2009, 11:49 AM
It's an introductory math class. I could have tested out of it, but I haven't done this stuff in 15 years, or so.

Don't you use percentages in daily life, it's all around us?