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Percent Problem - Use a Percent to Find the Whole
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- čas přidán 11. 11. 2015
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Set up and solve a proportion to find the whole if given a percent. A percent is a ratio that is always out of 100.
A quicker way to do this is:
1) Divide 45 by 18 (Giving you 2.5)
2)Multiply 2.5 by 100 (Giving you 250)
This only takes up to a minute at most to do.
Fast
Exactly she made this super difficult and that marker scratching on that paper with super annoying
@@unjaded2 you forgot to say "point of privilege".
hmm good
IRTG2006 thank you
Can’t lie but I think I actually learned something
Class8
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I’ve been looking up different math youtubers for research on my own channel and glad I found your videos!
Your explanations are so clear at at a good pace
Awesome! Thank you!
Class8
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My 4th grade teacher ruined my excitement to learn math.. I always did the bare minimum to just to pass.. I’m not bad at math but I want to be better.
hi! you may be older than me now but i can help you
That was the most complicated explanation of a complicated solution. I would have divided 45 by 18 and then multiplied by 100.
It is easy we can find the whole Or total by multiplying it by 100and dividing it by percentage
Class8
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@Hannah Lupher Congratulations on having 1 brain cell.
Divide 45 by 18 to work out 1% and then multiply it by 100 to work out 100%.
45/18= 2.5
1% = 2.5
2.5 x 100 = 250
100% = 250
45 =18%x.
45=0.18x.
45÷0.18=x.
x=4500÷18.
x=250.
Also kind of mind math. Your method is also correct. Nice video. Thank you for the video.
Why wouldn't it be a simple algebra problem?
45 = .18x
x = 45 / .18
x = 250
It is a big problem in this country. Teachers are not so creative but make students confused.
Wtf is the difference???
Yessss, but if she didnt do It this way un 2:24 paralelogram not exist. Thus not know she methodical and organized space thought.
That's how I did it!
Class8
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Used cross multiplication,
45*100/18=250.
Thank you so much. I have worked in hazardous materials response, explosives, inventory (of said explosives), and management. I'm really good at math usually, so good in fact, that i wrote an excel sheet that saved me hours a day for the inventory and management part of my explosives job. However, since i had all the numbers i never had to reverse proportions like this A&P class is asking me to do because i guess i just math'd my way around the holes in my knowledge. Watching this jogged my memory and now i'm smashing proportions with no problem.
Still annoys me how static and inflexible school questions can be. They really don't allow you to think and this is why i struggled in school sometimes, but i always excel in the field.
Shortcuts are cool but they really only work because there's an underlying appreciation for the long way. The people who are always belly aching about the long way of learning get on my nerves. Nothing is the short way. For example, we run in and grab something out of the store. But the manufacturer is rich because we "ain't got all day." The teacher here is like the manufacturer. She lays the foundation. Like what good is a house standing on a dirt floor? What good is a house of cards? Once you thoroughly get the concept, then you are free to use Shortcuts forever more. If you can't say something nice, move along. This teacher freely shared her knowledge. She didn't have to. She established a foundation so that the shortcut teacher will seem to be the hero. That shortcut only solves one style of the problems. You will still have to understand the rest of the techniques. I wouldn't want the shortcut guy as my accountant. I'd want the stickler. So. I celebrate this teacher. Thank you. We owe the world to "nerds," not to insulting jerks with half a brain. So, again, just saying, you are very appreciated. Party time to you. 😎
Thank you!!
Thank you so much for breaking this down so I could understand why you are doing every step. It really helps in creating a foundation for solving future problems. Subscribed!
Thank you mam
Clearly put. Precisely what learners need - the reasons why at every step.
Simple way is
18/100 * x=45
x=45*100/18
x=4500/18
x=250
Multiple steps are for better understanding of many.
Yes! there may be different ways of working out the problem, but I really prefer this method. The method used brakes down the problem and refreshes your memory; just in case you forgot about equations or long divisions. Thanks, works for me, and many others.
Class8
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Let the number be X.
18% of X=45
18/100 × (X) = 45
X= 45×100 / 18
X= 250. Ans.
This method is also simple.
Direct proportion, using a 2 row 2 column table makes it a very simple problem to explain in class. In first row: 45 next to 18
In 2nd row: x next to 100 (x the number we are looking for.
Hence
x/45 = 100/18
Hence
x = 45 × 100/18
x = 250
A quick check:
0.18 × 250 = 45
Class 8maths
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Cross multiply and divide... I’m currently teaching my daughter a 6th grader who says my method is much easy and they get to the answer quicker. 45x100=4500 18/4500=250
Class8
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I don't know why the hell this was in my recommendation and why I have watched this till the end 🤔🤔🤔🤔
Mee too 😂😂
Same
Class8
czcams.com/video/0xqoJ4_ll9E/video.html
I also got this video recommended.
Try my CZcams channel mathfullyexplained. It has percent.
I swear to god 20 videos later I finally
find something quick and easy unlike the others that take 30 minutes long
Great video.
Though you confirmed there’s other ways to do this sum, I would like to commend your explanation and method for doing the sun this particular way.
You’ve got the teaching nack!
Wish you were my maths teacher !
Class 8maths
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Fundamentally the concept of part/whole is a sound one. As far as calculation is concerned no need to multiply 45 and 100. Rather break 18 into 9 and 2 so that 9 divides 45 and 2 divides 100. 50×5 is 250. Mentally we may do it quickly but fundamental principle is do-undo.
Thanks for your help some comments showed a simpilar way but you showed me in a way that helps me to understand!
45 divided by .18 equal 250. Just change the percent to a decimal and divide
Try the fraction is over of and percent over 100. Every sentence has the word is and of in it. If there is a percent number write that over 100. If a number appears before the word is...u write that above the number that comes after of. Two numbers will be diagonal. Multiply those two and divide by the remaining number
Best to keep it simple.
45 is 18 percent of what number?
45 = 0.18x
See how the sentence and the expression are related?
This helped better than my teacher explaining to me
Omg thanks!!! You explain it so much like my teacher!!! I hope I pass math this quarter!!! I also subscribed!!!
This is really helpful, I didn't pass my math tests because of one problem... it say.. 5% of what number is 14.? Now because of you I understand that I miss that important 0 at the end. Thanks!
Class8
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Easier way was
18% = 45
1% = 45/18 = 2.5
100% = 2.5 x 100 = 250
Why go such an unnecessary long procedure ... ??
Superb 👍Jo Jo .thanq
WTH man X value is always 1know this 1st ... Instead 1 can take x instead x can take 1 ... Think ok..
Agreed Jo Jo, I solved it that way. I see now why so many children are complaining about math in school.
It must be a policy to frustrate them. 😃
TYSM! I've tried watching other vids but this one actually got me to understand what i'm supposed to be doing! thx a 1000!!
Although the process is long it is very helpful. Thank you Maria
Q: What is 45% of X ?
Ans: 45X/100
Q: Y is 45% of which number?
Ans: 100Y/45
All that cross multiplication has made me cross. She has over simplified the solution.
Omg 😮 i scrolled down, found world 🌎 is fully of brilliant people ...😍😍solved this less than 1 minute 🙆♀️🤩
Class 8maths
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the rule is (is on top of on the bottom period)...cross multiply and divide
the formula ORGINAL x Decimal/Part = answer
250 x .18 = 45
Class8
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I learned this in five minutes then I did fifty minutes in class.
Easiest way to solve this is just multiple 45 x 100 = 4,500
Now divide 4,500 ÷ 18 = 250
Good work Wish you all the best,..
thank you I am studying for my accuplacer and have forgotten a lot lol. THank you for taking your time to explain it!
What if I divided 45 by 18 = 2.5 and then multiply 2.5 by 100 = 250. Did I do it wrong?
Faster by a cross calculation
So : 45x100:18= 250
Math made difficult right here. Simple mathematics is to divide 45 by 18% which is 250. People, you don’t need fractions. It’s a simple division problem. Holy hell!
Don't forget to reduce up and down by 2 and left and right by 9 before cross multiplication, easy numbers for the kids 5 x 50 is 250.
She must have went to public school. Let's make everything 8 times harder than it should be
unjaded2
Exactly what I was thinking.
However, this way still beats the hell out of common core...
I'm from Egypt
I have anew way to answer
More easy and fast
I find it with myself
@@hamadadonya what is it please tell me or the video .I'm from egypt too and talk arabic
i went to a private school the 3rd most expensive school in my country and was taught grade three level in the 5th grade I now go to a public school and learn on a shanghai level of mathematics (this is in south africa)
Welcome to public school!!!
if you understand that 18/100 or 18% is = to the decimal 0.18, the 45/0.18=250.
thanks! I managed to finish my math with this ^^
Thank you! Clear and to the point. Very well done.
She did something in 5 mins which takes me 10 seconds guys just do 48 divided by 18 and then times it by 100 theres your answer
Thats because she has to explain it first...
Astijux 27 se ve que eres bien wey En tu forma de expresar Antes que nada ella esta enseñando y no esta presumiendo 😠
Astijux 27 how did u get 48???
Astijux 27 thank you.
And you got the wrong answer
Appreciatable,I don't believe what you believes in math, because math is a confusing subject for a lot of people even for me, but I believe in you.yes you can.
Thanks for this nyc video it helps me a lot
Good stuff. I’m not in school anymore but I enjoy learning. Math is important even though some don’t think so
Omg you are a life saver I have a test on Tuesday
Lol same
The way this problem is solved here is the method that must be used by someone with insufficient "number sense" (look that up) to solve it the most elegant way, as some of you did.
TYSM this helped a lot! Just a question though, is there a faster method to do this?
Excellent way to solve the problem and very easy way to teach some one I really appreciate thanks a lot 👍👍
What u says for this way 45*100/18= 250 because in reverse of average we multiply by 100 and divided by percentage
Thank you for showing all of the steps! :)
A simple trick
Just translate the sentence into symbols.
"is" is equivalent to equals (=)
"of" is equivalent to multiplication (x)
Let n be the unknown number
45 is 18% of what number?
45 = 18% x n
45 = .18n
250=n
n=250
Extremely laborious way, to solve a simple and basic calculation.
45 = .18x
X= 45/.18
To do this you know it's 2 to begin with since 2x 18 is 36, you're left with 9 which is .5 then multiply by 100 to get 250..
Who here is 2019? Im so late but this was very useful thank you!
Im later than you...its 2020
I don't know why is this in my recommended but it did sure helped me lmao
Google listens thru ur phone all d time
Try my CZcams channel mathfullyexplained
Percentages is helping my bussiness
Thanks a million for making that so simple,I totally understood that problem.
Class 8maths
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Will this work for every problem like that? I am asking this because, I’ve been using the multiplication. Say, 75% x 24. I would move the decimal for 75 and make it .75, multiply by 24 and I got 1800, which would just be 18 I believe and the answer was 32, when it told me to find what number that percentage went to. So, I began getting problems right and wrong, I need something that will always make it right. I then tried it in fraction way. . . 75/100x 24/1, or in the original problem, it would have been 24/1x75/100. But, I don’t know what it was but the answer was wrong frequently. And even if I did get it right, that would have been after hours of reducing. I can reduce, but I get so confused when it’s a big number. So basically, what I’m asking is: will this give me the correct answer everytime?
OMG YOU DESERVED A LIKE AN AN SUBSCRRIBER THIS HELPED SO MUCH THANK YOU SO MUCH!
Very simple way ever.
Thx
Take the main number, add two zeros, divide that by the percentage... Is that the correct formula?
Is over of is easier to use rather than parts and whole because is and of are written in the equation. Is over of.
Is. 45. 18%
_. -. -
Of x. 100. 45×100÷18
Let the no. be x
According to the problem
18% of x = 45
18/100 × x = 45
x = 45×100/18
x=5×100/2
x= 250
It is so easy....Who finds it difficult ?
U saved my life thanks.
People saying they do this in college I’m learning this in middle school lol
We learnt it in the 7th year of school.
You will realize that you will be taught the same thing over and over.
In india, we learn this in year 5. lol.
I’m learning it in 6th grade
My daughter is learning this in 7th grade math
Thank you.
Oh my thank you so much
I need this for my research
Interpretation of the Data
18x/100=45
X=4500/18
X=250
Lengthy procedure to solve a very small question
for getting more easy tricks ,please click here
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Use the percent circle on that
18% of t = 45
18% to decimal = .18
.18t=45
t=45/.18
t=250
Simply divide 45/.18=250
Thank you SO much! This was super helpful!
Its lengthy procedure...if
18 = 45
100=???(x)
Cross multiplication
45×100÷18= 250
Quickest and easiest way is by applying unitary method....
18% represents.=45
1%....=45/18
100%.....=45/18×100=250
I wish I'm good in Math like you Mamm,
Thanks.
Try my CZcams channel mathfullyexplained. It has percent and more units.
Raju fails with 20 marks in the exam, Rama passes with 50 marks in the exam, Raju needs another 10% to pass while Rama passes with only 5% more. So how much do you need for a pass?
45 -> 18%
x -> 100%
Cross multiply
4500 = x18
x = 4500/18
x = 250
You just make it more harder than it should be!Just devide 45 by 18,you will get 2.5,now multiply 2.5 by 100...easily you get the result!250!
I was taught in the seventh grade to cross-multiply, which quickly results in 4500 divided by 18. All this hyper-analysis is unnecessary.
Class 8maths
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If 18% is 45, then 1% is 45divided by 18 which = 5 divided by 2. Then multiply by 100 which gives 500 divided by 2 which =250. easy to do in your head.
Or just factor out the 2 x 9 and multiply 50 x 5 and forget the long division
Satisfying digits
Thanks for the lesson.
Thanks really help me
Yikkkkkes, cross multiple and divide. Piece of 🎂
45 * 100 = 4,500
4,500 / 18 = 250
Done son
Wonderful explanation 💖👨👧
Try channel mathfullyexplained
250 is the answer
I just love how you wrote the number 8
I did it this way: 100 divided by 18 = 5.555555555555556. Multiply that times 45 = 250. Boom.
Great explanation!
OMG she has done it in really hard way
45 x 100/18= 250 is the answer
Thank you so much. I get it now. Thanks so much for teaching us percent proration. Its really helpful:)
Class 8maths
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