Math help please? XD

trish • 12 December 2011 at 11:20 PM

Is there a simplier easier way of learning


'## is #% of what number?'

or


'## is what percent of ##?'








# = insert number (you insert random. XD)

My honor teacher teaches this the hard way which I'm not too steady on.

duchess • 12 December 2011 at 11:24 PM

@trish

Take the first number and divide it by the second, then multiply by 100. That's you you find out what the first number is as a percentage of the second,

Eg.

What percentage of 4 is 2?

2/4 x 100=50%

Hope that helps

trish • 12 December 2011 at 11:27 PM

@duchess What about um, like,

62 is 90% of what number?

duchess • 12 December 2011 at 11:28 PM

@trish

If 62=90%, then divide 62 by 90 to find 1%. Then multiply by 100 to find the number.

Deleted • 12 December 2011 at 11:35 PM

@Trish

What grade are you in? *facepalm*

trish • 12 December 2011 at 11:35 PM

@duchess Is there another way with the fractions? I'm very confused.

duchess • 12 December 2011 at 11:37 PM

@trish, Sorry, what do you mean? If you could give an example problem, I could help you solve it.

sakura2596 • 12 December 2011 at 11:41 PM

woah...... what grade are you in! that looks HARD!!!! what grade are you in,i hope i dont have to learn this soon ☹️

Deleted • 12 December 2011 at 11:42 PM

@Trish

67% of 90

67/100=n/100
67 times 90 = 100 times n
6030 = 100n
6030/100 = 100n/100 {Divide each side by 100}

67% of 90 is 60.3

COMPLICATED, HUH? XD

icymuffin • 12 December 2011 at 11:42 PM

Mmm? 62 is 90% of a number...

62/n = 90/100 (which stands in for 90%, n=## )
-> Cross multiply
-> 62 x 100 = 90 x n
-> 6200 = 90 x n
-> 6200/90 = n
-> 68.888888... = n

Check: 62/68.8888.... = .89999 = .9 = 90%
Yah? o^o That's how I learned it...

Deleted • 12 December 2011 at 11:42 PM

Dont looky.

Double post.

trish • 12 December 2011 at 11:53 PM

@chloekins I'd understand, but my eyesight is so poor I have to eat a carrot to improve it by a few degrees. XD Then again, my table is too distracting. XP

@icymuffin Thanks.(: I understand, it's just hard to see what my teacher is doing since I'm in the back & she won't move me. T-T

Deleted • 12 December 2011 at 11:54 PM

@Trish

*facepalm*

icymuffin • 13 December 2011 at 12:07 AM

@trish

You too? *highfives*
And when that's not the problem, I start doodling. x3

trish • 13 December 2011 at 12:10 AM

@chloekins Carrots disgust me. And I also missed two days of that lesson due to something else. 😋

silver_winged • 13 December 2011 at 12:13 AM

@trish
Have you learned algebra yet? You can translate those sentences pretty easily into algebra and solve from there. For example, 62 is 90% of what number? turns to 62 = .9x . When you're translating like that, "is" means equals sign, "of" means multiplication, and "what number" means a variable, like x.

angel_star • 13 December 2011 at 1:23 AM

@trish

O_O

62 = 0.9 X

.:. X = 62 x 10/9

= Answer.

😃

So.... if the question is 983 is 67% of n and you were told to find n, the working out would be :

963 = 0.67 N

.:. N = 963 x 100/67 😊

= 963/1 x 100/67 (cross stuff out if you can)

= Answer 😃

It's not really diificult if you know how to do it and you don't mess up the calculation like me 😃

zafeyry • 13 December 2011 at 6:22 AM

I know how to do it the Algebra way!

62=.9x
Divide both by .9
62 (division sign) .9 = x
68.8(8 is repeating) = x

Check, because I'm most likely wrong.
62=68.8(repeating) times .9
62=62

I got it right 😃

space • 13 December 2011 at 6:30 AM

@trish
I have the same solution as @zafeyry 😸

62=.9x [x as a certain unknown number]
62/.9 = x [division property]
68.89 = x [round off]

check:
68.89 * 9 = 62
62 = 62 [true]