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- Thread starter Dinnerout
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250 is to 150 as X is to 100Dinnerout said:1) 250:150=x:100

I think it's called proportion.

Dinnerout said:Hi everybody,

I've got a question for american natives about maths reading.

How do you read the following expressions?:

1) 250:150=x:100

2) 120^5

Thanks in advance!!

The first one seems to be an

so

This is just a guess, I'm not a native!! But I also want to know how to read that!!

I don't know what the symbol in the second one means!

David said:

Good to know David!! Thank you!!

silviap said:250 is to 150 as X is to 100

I think it's called proportion.

My American Theacher told me:

"Two hundred and fifty over one hundred and fifty, equals x over one hundred"

Is she right? Whether or not, let me know.

For the second question she told me:

"one hundred and twenty at the fifth".

How about that?

Thanks for your time.

250/150=x/100, it could be read either "Two hundred fifty over one hundred fifty equals x over 100," or "Two hundred fifty divided by one hundred fifty equals x divided by 100."

However, if it is written as a proportion, 250:150=x:100, it should be read "Two hundred fifty is to one hundred fifty as x is to 100."

The same kind of relationship can be used for verbal relationships, when it is called an analogy: hat:head::glove:hand.

Dinnerout said:My American Theacher told me:

"Two hundred and fifty over one hundred and fifty, equals x over one hundred"

Is she right? Whether or not, let me know.

For the second question she told me:

"one hundred and twenty at the fifth".

How about that?

Thanks for your time.

I think she is right,

a number that results from dividing one whole number by another, or a small part of something:

I'm not sure about the second one, I've found this definition.

power (MATHEMATICS) the number of times that a number is to be multiplied by itself:

3 to the power 4 is usually written as 3

(from Cambridge Advanced Learner's Dictionary)

*

Dinnerout said:My American Theacher told me:

"Two hundred and fifty over one hundred and fifty, equals x over one hundred"

Is she right? Whether or not, let me know.

For the second question she told me:

"one hundred and twenty at the fifth".

How about that?

Thanks for your time.

You would not say "at the fifth" but "

Dinnerout said:Hi everybody,

I've got a question for american natives about maths reading.

How do you read the following expressions?:

1) 250:150=x:100

2) 120^5

Thanks in advance!!

1) 250 is to 150 as x is to 100

2) 120 raised to the fifth power (120 power 5)

David said:However, if it is written as a proportion, 250:150=x:100, it should be read "Two hundred fifty is to one hundred fifty as x is to 100."

That's exactly the way I read it. However, I'm not particularly good in math, so I didn't say anything because I didn't know if there were perhaps some alternative meaning of which I was unaware!

In other words: 120^5 = 24,883,200,000

(Source)The division sign resembles a dash or double dash with a dot above and a dot below (÷). It is equivalent to the words "divided by." This symbol is found mainly in arithmetic texts at the elementary-school level. It is rarely used by professional or academic mathematicians, scientists, or engineers.

Mathematically, the division sign is equivalent to the forward slash. Thus, for example, 4 ÷ 5 = 4/5 = 0.8, and -100 ÷ 10 = -100/10 = -10. In general, for any real number x and any nonzero real number y, the following is always true:

x ÷ y = x/y

The division sign is also mathematically equivalent to the ratio symbol, customarily denoted by a colon ( : ) and read "is to." Thus, for any real number x and any nonzero real number y, this equation holds:

x ÷ y = x:y

But as it does not appear to have shown up yet, in the interests of general enlightment I hereby post it again..

F

Focalist said:Vc,

:

is another way of writing

÷

or

/

to represent division.

This is a common mistake that really bugs me.

15:20 is a

Think of the score of a game. 9-14. One team got 9 points, the other team got 14 points. The fraction for team one is 9/23; the fraction for team two is 14/23.

Also, as an American, I see 1,300 as one thousand three hundred. However, Europeans see it as one point three. The way they would write one thousand three hundred would be:

This is read like this: "250 to 150 equals x to 100"

This is a ratio and is comparing something to something else.

If this helps at all....

250/150=x/100

25000=150x

166.66666666=x

Yes! Thats what it is! I knew it was familiar...silviap said:250 is to 150 as X is to 100

I think it's called proportion.

modgirl said:

Also, as an American, I see 1,300 as one thousand three hundred. However, Europeans see it as one point three. The way they would write one thousand three hundred would be:1.300.

No - I would agree with you Americans here - this is a ratio. There is a total of 35 whatevers split in the ratio (or proportion) 15 to 20.

So for example if it is boys compared to girls in a class then out of the total 35 children 15/35 = 3/7 of the class are boys and 4/7 of the class are girls.

Dinnerout said:Hi everybody,

I've got a question for american natives about maths reading.

How do you read the following expressions?:

1) 250:150=x:100

2) 120^5

Thanks in advance!!

Well, Dinnerout, don't pay attention to my message. Since I am not an American native...

I agree with your teacher, we do the same in Argentina. It seems in the States they have different mathematics conventions. So, take what they say. To be on the safe side...

Bye, Art

And the ratio of Team 1 points to the total of points scored was 9:23, that of Team 2 was 14:23 -- or was it not?Nick said:NO NO NO!Think of the score of a game. 9-14. One team got 9 points, the other team got 14 points. The fraction for team one is 9/23; the fraction for team two is 14/23.

F

Ratio without "of X to Y" is like 9:14 -- you add them to find the total.Focalist said:And the ratio of Team 1 points to the total of points scored was 9:23, that of Team 2 was 14:23 -- or was it not?

Ratio of Team 1's points to the total points is like 9:23 -- you don't add them because you know what is being compared, you are given the total. Generally, though, you don't use a ratio like this. One would normally use a fraction. This is a different definition of ratio, one which I do not like because it conflicts with the first definition. This is called a proportion (two ratios set equal to each other). Then they behave just like fractions because you can do the same mathmatical operation to both sides of the equation.